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Govind Ballabh Pant University of Agriculture and Technology, Pantnagar

After independence, development of the rural sector was considered the primary concern of the Government of India. In 1949, with the appointment of the Radhakrishnan University Education Commission, imparting of agricultural education through the setting up of rural universities became the focal point. Later, in 1954 an Indo-American team led by Dr. K.R. Damle, the Vice-President of ICAR, was constituted that arrived at the idea of establishing a Rural University on the land-grant pattern of USA. As a consequence a contract between the Government of India, the Technical Cooperation Mission and some land-grant universities of USA, was signed to promote agricultural education in the country. The US universities included the universities of Tennessee, the Ohio State University, the Kansas State University, The University of Illinois, the Pennsylvania State University and the University of Missouri. The task of assisting Uttar Pradesh in establishing an agricultural university was assigned to the University of Illinois which signed a contract in 1959 to establish an agricultural University in the State. Dean, H.W. Hannah, of the University of Illinois prepared a blueprint for a Rural University to be set up at the Tarai State Farm in the district Nainital, UP. In the initial stage the University of Illinois also offered the services of its scientists and teachers. Thus, in 1960, the first agricultural university of India, UP Agricultural University, came into being by an Act of legislation, UP Act XI-V of 1958. The Act was later amended under UP Universities Re-enactment and Amendment Act 1972 and the University was rechristened as Govind Ballabh Pant University of Agriculture and Technology keeping in view the contributions of Pt. Govind Ballabh Pant, the then Chief Minister of UP. The University was dedicated to the Nation by the first Prime Minister of India Pt Jawaharlal Nehru on 17 November 1960. The G.B. Pant University is a symbol of successful partnership between India and the United States. The establishment of this university brought about a revolution in agricultural education, research and extension. It paved the way for setting up of 31 other agricultural universities in the country.

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  • ThesisItemOpen Access
    Application of RSM in design improvement of honeycomb sandwich panel
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-10) Nagendra Kumar; Misra, Anadi
    The geometry and dimensions of honeycomb structure affects the energy absorption characteristics of sandwich structure. It is essential to investigate the dimensional parameters of honeycomb structure on core under impact loading conditions. The combined and individual effect of each design parameter can be studied using response surface method (RSM).The objective of current research is to investigate the effect of various design variables on energy absorption characteristics of sandwich honeycomb structure. The CAD modelling and FEA simulation is conducted on honeycomb structure using ANSYS simulation package. The design of honeycomb sandwich structure is optimized using response surface method (RSM) to determine dimensions for maximum and minimum deformation and stresses. The honeycomb sandwich structure has shown good energy absorption characteristics. The internal energy of sandwich honeycomb structure changes abruptly as the bullet pierces through honeycomb structure. The force reaction by honeycomb structure in optimized design is found to increase by nearly 26.7%. The optimized design is able to further reduce kinetic energy of bullet during exit from sandwich structure by 23%.
  • ThesisItemOpen Access
    Modelling and analysis of hierarchical honeycomb structure using finite element method
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-10) Shah, Amit Kumar; Misra, Anadi
    Honeycomb structures are strong and light composite structures with a high load bearing capability. A hierarchical honeycomb is a bio-inspired novel honeycomb shape that is employed for structural applications. The stiffness behaviour of hierarchical honeycombs is influenced by superstructure geometry. The deformation of a superstructure-based hierarchical honeycomb with varying cell lengths (4.36 mm, 5.32 mm, 6.28 mm, and 7.14 mm) was investigated in this research. For out of plane directed crushing, a numerical approach using the ANSYS static structure module was applied. The effects of various superstructure geometries were investigated. The boundary condition of a three point bend test configuration was performed on the structure. A deformation force of 200N, 400N, 600N, 800N, and 1000 N was applied at the midpoint of the honeycomb structure's span. The deformation caused in the member reduces as the superstructure cell length rises. The structure gets stiffer and exhibits less deformation as the core height increases. The honeycomb sandwich structure becomes stiffer as the thickness of the face sheet increases. Where weight is not an important structural criterion, a super-structure honeycomb sandwich structure may be the best solution.
  • ThesisItemOpen Access
    Numerical investigations on phase change materials in a horizontal shell and tube thermal energy storage system using different fin configuration
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-09) Mallik, Shubham; Mallik, Shubham; Mallik, Shubham; Bhandari, S.S.; Bhandari, S.S.; Bhandari, S.S.
    In order to improve the melting performance of phase change materials (PCM) in latent heat thermal energy storage unit (LHTES), the Angled rectangular with U-shaped tip fin design is proposed in this work. A two-dimensional numerical model based on enthalpy porosity method and Boussinesq approximation were used to model PCMs phase change transformation and the Buoyancy effect. The melting behavior of PCM is investigated by melt front evolution, temperature variation, effect of natural convection and variation of Stefan and Fourier number respectively. The results conclude that Angled rectangular U-shaped tip fin LHTES design is best suitable to enhances melting performance of PCM. The melting time decreases by 80.60 %, 74.42 % and 79.69 % as compared to Bare pipe for Angled rectangular with U-shped tip fin for PCMs Lauric acid, Paraffin wax and Capric acid respectively. The solidification time also decreases by a factor these PCMs. The melting time also decrease by a factor of 71.13 % due to rotation effect of whole domain for Angled rectangular with U-shaped tip fin latent heat thermal energy storage system.
  • ThesisItemOpen Access
    Investigation on the thermal performance of shell and tube thermal energy storage system using paraffin wax as phase change material
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-09) Tiwari, Mayank; Verma, Prashant
    Energy conversion is an essential aspect of technology advancement, and hence its efficient generation and use are important in today's scenario. In present scenario, there is a large gap between demand and supply, and it is difficult to meet the current energy requirement. Thermal energy storage devices enable us to attain energy demand while simultaneously minimizing pollution. The semi-circular outer shell geometry of the LHTES unit with and without fins on the inner tube using paraffin wax as phase change material has not been investigated yet. Hence it has been decided to investigate the melting performance of paraffin wax numerically and experimentally for circular shell, semi-circular shell without fins and semi-circular shell with finned tube latent heat thermal energy storage (LHTES) systems. Numerical analysis of two-dimensional model of different configurations of the LHTES system has been performed in Ansys fluid fluent to investigate the thermal performance of paraffin wax. Since natural convection plays important role in the melting process so the outer shell geometry is modified to semi-circular so that whole PCM is present in the upper portion and the heat transfer between the solid PCM and liquid PCM improves. In order to further improve the thermal performance fins are added to inner tube of the LHTES unit. Therefore, five different configurations including three different semi-circular with finned tube for different fin angles ( = 60º, 90º, 120º), semi-circular without fin, circular configuration have been investigated for the melting performance of the PCM. The results for a semi-circular shell with a fin angle of 90º for the LHTES system are found better as the thermal energy storage rate of finned tube LHTES system is 0.11 kW, which is 110% higher as compared to circular and 88% higher as compared to the semi-circular LHTES system. The semi-circular shell with finned tube LHTES melts the PCM completely in 66 minutes which is 54.98% less than the circular LHTES system and 32.65 % less in comparison to semi-circular without fin configuration. Thermal energy stored in the circular and semi-circular without fins arrangement of LHTES unit is 275.7 KJ and 290.37 KJ respectively. The thermal energy stored in the semi-circular LHTES unit with fins on the inner tube is 297 KJ which is 7.72% more as compared to the circular configuration and 2.3% more than the semi-circular without fins arrangement for same time period of 7200 sec. The thermal energy storage efficiency of semi-circular with finned tube LHTES unit has been found 6.72% higher than that of the circular LHTES system and 2% higher than the semi-circular without finned tube LHTES.
  • ThesisItemOpen Access
    Experimental and simulation studies on blanching and its impact on drying rate of carrot
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-10) Joshi, Ashutosh; Pratihar, A.K.
    Fruits and vegetables are high in minerals, vitamins, antioxidants and fibers but low in fat and calories, which is beneficial to human health. Because fruits and vegetables are seasonal and do not hold for long, techniques such as drying, freezing and canning are used to extend their shelf life. Blanching is a heat treatment process performed before these processes to improve safety and quality. Carrots are one of the healthiest vegetables because they are high in carbohydrates, minerals like calcium, phosphorus, iron, sodium, zinc, magnesium and vitamin C. Blanching of carrot and its effect on drying rate of carrot has been investigated in this study by experimental and numerical methods. Besides this various thermo-physical properties required in simulation have been determined through experiments and using correlations. The simulation of the blanching process has been carried out using ANSYS Fluent software to determine the temperature distribution in carrot during blanching at optimum combination of temperature and time (95°C for 5 minutes). Carrots have been actually blanched at 4 different temperatures-time combinations; 80°C for 7 minutes, 85°C for 7 minutes, 90°C for 7 minutes and 95°C for 5 minutes. Under these blanching conditions, the effect of separating carrot cortex and core from the slice on their drying rate has also been studied. For various configurations, the Page model has been used to perform regression analysis and estimate the value of the drying constant (k). The hot air has been used for drying carrot samples, where a constant temperature of 70°C±0.1°C and a constant velocity of 0.5 m/s have been maintained. According to the present study, the drying rate of core has been found to be the highest for each blanching combinations followed by cortex and slice. Blanching also improves the drying constant and it can be seen that at optimum blanching conditions, the drying constant for slice, cortex and core is 22.84%, 24.90%, and 36.94%, respectively higher than for similar parts of the unblanched sample.
  • ThesisItemOpen Access
    Optimization of resistance spot welding process parameters for cold rolled mild steel lap joint based on tensile shear strength
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-10) Pankaj Kumar; Bisht, Neeraj
    Owing to its numerous applications weld characteristics of cold rolled mild steel grade IS 513 CR 1 was investigated. Resistance spot welding, one of the most versatile welding technology was used for the purpose. The three most important parameters of the RSW namely welding current, welding time and electrode pressure were varied and the influence on the Tensile Shear Strength (TSS) was evaluated. The experiments were carried out according to Taguchi's L9 orthogonal array and Taguchi analysis was used in optimization. A lap joint of dimensions 120mm x 30 mm x 1.5mm was welded using a 100 kVA timer, current-controlled CSP-100PR Spot Welder, to create an overlap of 3 mm thickness. According to Taguchi’s L9 OA welding current cycles of 5, 10 and 15 were selected. During the welding process, the welding current was changed by adding 2 kA from 10 to 14 kA and the electrode pressure were taken to be 4, 5 and 6 bar. The Main effects plots revealed the optimal setting for the process parameters as welding current of 14 kA (Level 3), welding time of 15 cycles (Level 3), and electrode pressure of 4 bar (Level 1). The optimized process parameters showed the maximum TSS of the spot weld joint. ANOVA was carried out to identify the significant process parameters affecting the weld strength. Furthermore, the contribution of welding current was found to be 67.38% which had the maximum influence on the TSS of the welded joint. The contour plots showed that on increasing welding current and welding time with decreasing electrode pressure the Tensile Shear Strength of lap joint was increased by 55.78%, 26.27% and 33.65% respectively
  • ThesisItemOpen Access
    Fabrication and characterization of maleic anhydride treated hemp fibre reinforced PVA based bio composite
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-10) Prem Kumar; Chauhan, Sakshi
    Composites are used in practically every area of engineering because to their affordability and biodegradable nature. One of the significant biodegradable polymers that has gained attention internationally over the past ten years for the creation of biodegradable composite is polyvinyl alcohol. Polyvinyl alcohol is used as a matrix in the field of material science because it may be used to make green plastic and composite materials. A modest attempt to create a surface-treated hemp fibre reinforced PVA-based composite has been made in the present work. Maleic anhydride and alkaline treatments were used to alter the surface. After surface treatment, manufacturing of a reinforced polyvinyl alcohol-based cross-linked composite was carried out, and three different weight percentages of hemp (5%, 7%, and 9%) maleic anhydride were used for the experiment. Fabricated samples are firstly examined based on physical tests which consisted of the water absorption tests. Microstructural tests included the Scanning electron microscope (SEM), mechanical tests comprised of the tensile test and hardness test. Finally, the thermal tests were also done which involved the thermo-gravimetric analysis (TGA) and Dynamic mechanical analysis (DMA). The treated hemp fibre reinforced PVA based composite with maleic anhydride (MA) 7% weight content is confirmed to be the best of all compositions under this scrutiny which was authenticated by the thermal test and mechanical tests.
  • ThesisItemOpen Access
    Development of heat transfer correlation for novel rotating packed bed using air water system
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-09) Rana, Dheeraj Singh; Murthy, D. S.
    Rotating packed bed (RPB), which is a multiphase contactor operating in centrifugal field 100-1000 times of the gravitational field, works on the principle of “Hi- Gee”. In RPB, centrifugal field governs the liquid flow, which resulted in miniaturization of conventional columns in chemical industries which have only gravity as driving force. RPB has received considerable attention for mass transfer intensification and it has been well established in chemical industries due to its multi advantages over conventional columns. The analogy between the heat and mass transfer suggests that this modern concept can also play a vital role in heat transfer intensification and size reduction in thermal industries by replacing conventional cooling towers. Present study was taken to explore the thermal behaviour of RPB for air-water system. The study presents thermal analysis of the counter-current flow for air-water system in a RPB with wire-mesh packing. The primary focus was on the performance of the RPB via thorough assimilation of heat transfer rate at different operating parameters such as air flow rate (0.0076 to 0.0202 kg/s), water flow rate (0.033 to 0.133 kg/s), water inlet temperature (35 to 45°C) and rotor speed (400 to 2000 rpm). In addition, heat transfer correlation has been also purposed by considering the effect of geometric parameters, operating parameters, structure of the packing, and nature of the packing. Results shows that heat transfer rate increases with air flow rate and water flow rate. Heat transfer rate for RPB increased with rotational speed of packing from 400 RPM to 1200 RPM and then started decreasing up till 2000 RPM. It also showed increment with water inlet temperature and was found to be maximum at 45°C, at water flow rate of 0.133 kg/s, and air flow rate of 0.0202 kg/s and at rotational speed of 1200 RPM. Evaporative heat transfer was found to be dominant mode of heat transfer and found to constitute 64 to 79% of total heat transfer. The results for overall heat transfer rate were compared with previous study and estimated heat transfer error was found to be ± 10%.
  • ThesisItemOpen Access
    Effect of notch radius on mechanical properties and stop holes on fracture behaviour of friction stir processed 6061-t6 aluminium alloy
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-10) Bisht, Nikhilesh Singh; Gope, P. C.
    Aluminium alloy6061-T6 is a widely used material in aerospace, shipping, aviation, and automobile industries. In the present investigation, tensile test experiments were performed on friction stir processed Aluminium alloy 6061-T6 with different process parameters of transverse speeds 25, 50, and 75 mm/min and rotational speeds 700, 1050, and 1400 rpm and effect Notch root radius was studied by changing the notch root radius as 1.5, 2, 2.5 mm. The results obtained from the tensile tests were analysed in terms of Stress-Strain curves. The effect of change in Notch root radius was discussed. Mostly the specimen tested with notch root radius 1.5 mm sustained maximum Stress values with least strain. Mechanical properties have been observed with the base material having maximum strength and the friction stir processed material having relatively reduced strength. Fatigue life cycle experiment were also performed on the CT specimens having FSP with 25 mm/min transverse speed and rotational tool speed of 1400rpm respectively and effect of stop hole was discussed. The results obtained from the fatigue life cycle test were analysed intense of a-N curve. The fatigue life for the FSP CT specimen with 25mm/min transverse speed and rotational tool speed 1400 rpm without stop hole, with stop hole 4.5mm away from crack tip in centre line, with stop hole 4.5mm away from crack tip and 1.5mm offset and the base material specimen was found to be 20951, 33864, 38995 and 26865 cycles respectively. ANSYS comparative analysis has been done of fatigue life in SMART crack growth 2022 R2 version. Scanning Electron microscope (SEM) test was carried out to study fractured surface at different locations.