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Vinze R.,DIAT | Chollackal A.,Indian Institute of Technology Bombay | Limaye M.D.,RandDE E | Prabhu S.V.,Indian Institute of Technology Bombay
Experimental Thermal and Fluid Science | Year: 2016

An experimental investigation is carried out to study the local convective heat transfer between smooth wedge shaped plate and a single round underexpanded impinging jet, using thin metal foil technique and IR camera. In the present study experiments are carried out for five different nozzle pressure ratios in the range of 2.36-5.08. The jet-to-wedge apex distance (z/d) is varied from 1 to 12 nozzle diameters. The influence of the included angle of wedge is studied by carrying out experiments for three apex angles of 31.5°, 63° and 94.5°. Heat transfer coefficient is calculated based on wall temperature. The local Nusselt numbers, stagnation point Nusselt numbers and recovery factor distribution are reported in present study. Shadowgraphs are used to explain distribution of Nusselt number and recovery factor. It is concluded that local Nusselt number and recovery factor are greatly affected by the nozzle pressure ratios but independent of wedge apex angle. © 2016 Elsevier Inc. Source


Meena H.C.,Indian Institute of Technology Bombay | Reodikar S.A.,Indian Institute of Technology Bombay | Vinze R.,DIAT | Prabhu S.V.,Indian Institute of Technology Bombay
Experimental Thermal and Fluid Science | Year: 2016

An experimental investigation is performed to study the influence of the shape of the orifice (circular, square, triangular and elliptical), jet to plate distances and Reynolds number on the local heat transfer distribution to normally impinging submerged air jet on smooth and flat surface. The Reynolds numbers were varied from 5000 to 30,000 in the steps of 5000 and the jet to plate distances used were 0.5, 1, 2, 4, 6 and 8. The equivalent diameter (ratio of area to the perimeter) of all the orifices were maintained nearly constant (5.7 mm). The local heat transfer characteristics are estimated using thermal images obtained by infrared thermal imaging technique. For all the shapes, the area averaged Nusselt number increases with increase in Reynolds number. The area averaged Nusselt number at all Reynolds number is observed to be highest at a z/d of 4. Axis switching is observed for all the shapes except circular orifice. The square, triangular and elliptical orifice respectively undergoes a 45°, 180° and 90° axis switch. Pressure loss coefficients of various orifices are reported. © 2015 Elsevier Inc. Source


Deore G.B.,Fergusson College | Limaye A.S.,Nowrosjee Wadia College | Dushing Y.A.,Fergusson College | Dhobale S.B.,Fergusson College | And 2 more authors.
Pakistan Journal of Biological Sciences | Year: 2013

The problem of metalnutrient deficiency is becoming more serious with the introduction of modern agricultural practices. As a result, metalnutrient deficiency is recognized as one of the critical yield limiting factors. Metalnutrients are generally offered in their sulphate or oxide forms. However, it is reported that organically bound minerals generally have a higher bioavailability than inorganic minerals. Chelation makes otherwise unavailable metalnutrients plant available. Amino acids are well known among various chelating agents. In present investigation the fungus Paecilomyces variotii PR-4 was isolated from soil and was used for production of protease and determination of its activity. Proteins from germinating seeds of chickpea, mung bean, soybean and cowpea were hydrolyzed for the production of amino acids. Amino acids were recovered, estimated and utilized for chelation of metalnutrients viz., Zn, Cu, Fe, Mn, Mg, B and Mo. The resultant chelates were employed to detect with Fourier Transform Infra-Red Spectrophotometer (FTIR) analysis. The peaks of most intensive bands in the IR spectra of ligands recorded were present in the intervals of the wave numbers 3500-3300 and 1720-1700 cm-1. Chelation of metalnutrients led to the broadening of peak and changes of the peak position of hydroxyl groups, which indicated the binding of the carboxylic groups and primary amine groups of amino acids to the metalnutrients. The resultant amino acids-metalnutrient chelates can be utilized as organic fertilizer. © 2013 Asian Network for Scientific Information. Source


Reodikar S.A.,Indian Institute of Technology Bombay | Meena H.C.,Indian Institute of Technology Bombay | Vinze R.,DIAT | Prabhu S.V.,Indian Institute of Technology Bombay
International Journal of Thermal Sciences | Year: 2016

An experimental investigation is performed to study the effects of the orifice shape and Mach number (M) on the local heat transfer distribution by normally impinging compressible jets. Four different orifice cross-sections namely circular, elliptical, square and triangular are used and jets Mach number is maintained from 0.4 to 1in present study. The heat transfer is measured by thin foil IR technique for different nozzle to plate distances. To calculated Nusselt number, adiabatic wall temperature is used as a reference temperature. The stagnation point Nusselt number is significantly higher for circular orifice as compared to other three shapes while that for the elliptical orifice is minimum. Recovery factor distribution is independent of the Reynolds number and the Mach number. The square, triangular and elliptical orifice respectively undergoes a 45°, 180° and 90° axis switching. © 2016 Elsevier Masson SAS. All rights reserved. Source


Vinze R.,DIAT | Chandel S.,DIAT | Limaye M.D.,R and D E E | Prabhu S.V.,Indian Institute of Technology Bombay
Experimental Thermal and Fluid Science | Year: 2016

Influence of chevron nozzle on local heat transfer distribution over a flat plate impinged by incompressible jets is studied for Reynolds numbers of 28,000, 35,000 and 40,000. Ten different chevron nozzle configurations are studied with a pipe diameter of 10.8 mm. Thin metal foil technique is used with IR camera to measure the wall temperature at nozzle to plate distances (z/d) from 1 to 10. An increase in the local Nusselt number by 26-38% compared to that with circular pipe is measured. It is observed that N10 nozzle (with number of chevron tips n = 8 and chevron tip angle θ = 10°) provides best heat transfer performance. A correlation for the average heat transfer is proposed in present study. A multiplication factor is also introduced to predict local Nusselt number for N10 nozzle. © 2016 Elsevier Inc. Source

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