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Master Degree Theses

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1986 - 198931990 - 19992
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Subject: Soil and Water Engineering ×

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    ThesisItemOpen Access
    Effect of Pipe Size and Foot Valves on the Performance of Centrifugal Pumps
    (Department of Soil and Water Engineering N.M. College of Agriculture Gujrat Agricultural University Campus, Navsari, 1986-01) Shukla, Surendra P; Mallik, M.
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    ThesisItemOpen Access
    Rainfall Runoff Relationship in Small Agricultural Watersheds
    (Soil Science and Agricultural Chemistry Department, N. M. Colelge of Agriculture Navsari Agricultural University, 1987-05) Patel, Ramanbhai Motibhai; Mallik, M
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    ThesisItemOpen Access
    Possibility of Supplemental Irrigation by Water Harvesting in Semi-Arid Tropics
    (Soil Science and Agricultural Chemistry Department, N. M. Colelge of Agriculture Navsari Agricultural University, 1987-10) Ghaghada, Ratilal Hiralal; Mallik, M
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    ThesisItemOpen Access
    Hydraulic Performance of Centrifugal Pumps with Different Pipe sizes, Pipe Fittings and Suction Lifts
    (Soil and water Management Department, N. M. College of Agriculture Gujarat Agricultural University Navsari, 1997-12) Chalodia, Arvindkumar Laljibhai; Shukla, S.P
    The present investigations on "Hydraulic performance of centrifugal pumps with different pipe sizes. pipe fittings and suction lifts". were carried out by creating necessary testing facilities at the Research Farm of Soil and Water Engineering Department. N.M.College of Agriculture. Gujarat Agricultural University. Navsari Campus. Navsari during 1996-97. Three monoblock (3.0 hp. 5.0 hp and 7.5 hp) and one coupled (5.0 hp) centrifugal pumps were used for testing. These pumps showed wide variability in their performance with different type and size of suction and delivery pipe combinations as well as static suction lifts. The best performance of these pumps was achieved either at 1. 0 m or• 2.0 m suction lifts. There was marginal drop ,n the pump efficiency and discharge at 3.0 m suction lift. static suction lift. the Among different Beyond 3.0 m pump performance declined sharply. pipe combinations tested. RPVC pipe combinations were found to be superior which not only gave maximum duty point efficiency but also higher efficiency throughout the total head working range at 1.0 m to 6.0 m static suction lifts. In general. efficiency of different pumps with RPVC pipes increased from 1 to 18.5 per cent at different suction lifts including best one. The duty point efficiency of 3 . 0 hp. 5.0 hp. 7.5 hp (monoblock) and 5.0 hp (coupled) pump sets with RPVC pipes improved by 2.0 to 18.5 per cent. 4.0 to 11.4 per cent. 3.5 to 11.0 per cent and 1.0 to 5.0 per cent. respectively at 1.0 m to 6.0 m static suction As lifts. regards the sizes of G.l. pipe combinations. all the pumps performed better witb bigher size suction and delivery pipe combinations than the pump flanges as compared to the same and lower size of pipe combinations. Of the ten foot valves evaluated for their impact on pump performance. at constant total head (17 m) and suction lift (3 m) the foot valve no.2 (CBIP) was found to be the best giving highest pump efficiency of 61.9 per cent with highest discharge of 15.8 lis and lowest total suction lift (4.73 m). The pump efficiency with this foot valve increased by 4.7 to 10). to 12.6 per cent as compared to others (no.l and 3The results of four comhinations of elhow and hend each of G. I. (80 mm) and RPVC (84 mm) on performance characteristic of 5.0 hp. 80 mm x 80 mm monohlock pump at 3.0 m static suction lifts indicated that among the comhinations of RPVC (hend and elhow). the pump gave hest performance with combination of hends in suction and delivery sides in the total head working range of 10 m to 22 m with which the discharge. power consumption and pump set efficiency varied from 18.36 lis to 7.94 lis. 4.7 hp to 5.33 hp and 48.2 to 58.1 per cent. respectively. The highest efficiency (58.1%) was ohserved at 18.0 m total head with discharge of 12.90 lis and 5.33 hp power consumption. Further the use of bend in suction and elbow in delivery improved the pump efficiency from 38.1 to 41.8 per cent at 10 m total head and 49.8 to 54.0 per cent at 18 m total head as compared to elhow in hoth the sides. However. there was marginal change in pump efficiency «2 %) when elhow in delivery side was replaced hy hend keeping elhow in suction side. Similarly. combinations. among the G.I. elbow and hend the best performance of centri fugal pump was achieved with comhination of hends in suction and delivery sides giving discharge. power consumption and pump set efficiency as 17.14 lis to 8.57 lis. 5.21 hp to 5.46 hp and 43.9 to 56.4 per cent. respectively in the total head working range of 10 m to 22 m. The highest efficiency (56.4%) was observed at 18.0 m total head with discharge of 12.53 lis and 5.33 hp power consumption.
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    ThesisItemOpen Access
    Three Dimensional Water Front Movement in Heavy Black Soil for Trickle Emitter
    (DEPARTMENT OF SOIL AND WA.TER ENGINEERING, N. M. COLLEGE OF AGRICULTURE GUJARAT AGRICULTURAL UNIVERSITY, 1999-07) SAVANI, NANALAL GANGDAS; Mallik, M
    Trickle irrigation method is the most economical and efficient method of irrigation and therefore becoming more popular in India. With a view to meet plant water requirement of a crop with trickle irrigation, it is most important to fmd the size and shape of wetted bulb formed in a particular soil for different time intervals and discharges. The present investigations on three dimensional water front movement in heavy black soil for trickle emitter were carried out in laboratory as well as in the field of Depru Ullent of Soil and Water Engineering with three discharge rates nrunely 2 Lph, 4 Lph and 8 Lph and four water application interval nrunely every day, one day, two day and three day. Size and shape of wetted bulb were detellllined for all treatments combination by applying constant volume of six litres of water with three replications. To deteIllline the vertical water front advance from the point source of water application with respect to elapsed time, a special electronic instrument was developed and tested in the laboratory and it was used repeatedly for measuring water front advance. The moisture content on dry basis were measured from different grid points after two hours of tellnination of water application. It was found that the profile of water front advance resulting from point source of water application was semi-eJliptical in shape. The maximum horizontal water front advance from the point source increased from 28.8, 26.0, 24.4 and 23.0 cm to 41.3, 38.2, 34.8 and 31.2 cm, whereas the maximum vertical water front advance decreased from 64.2, 58.8, 54.8 and 52.0 cmto 42.7, 38.9,36.2 and 33.3 em with increase in discharge rate from 2 Lph to 8 Lph for everyday, one day, two day and three day water application intervals, respectively. Mathematical equations were developed to predict horizontal and vertical water front advance from point source with respect to elapse time for each treatment. The maximum moisture content of 33.9 per cent was recorded near the point source of water application and it decreased with increase in distance from point source .