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RISS 인기검색어
- 검색키워드
- 저자 : Varun Goel (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Effect of providing gap in multiple-arc rib-roughened solar air heater - Part 1
Rajneesh Kumar,Varun Goel,Mukesh Kumar 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.6
Roughness is an effectual way to augment heat transfer in solar air heater (SAH). Multiple arcs (with gap) type of roughness has considered in this work and experimentation is performed to determine their effect on thermo-hydraulic performance of rectangular channel SAH duct. The experimentation is performed to analyze the effect of different parameters (both roughness as well as flow). Roughness parameters; number of gaps (N g ) and rib gap width (g) has considered with fixed value of pitch (p), rib width (w), rib height (e), arc angle (α). The effect of considered parameters was investigated experimentally on Nusselt number (Nu) and friction penalty (f). Strong impact of roughness parameters is observed on the Nusselt number (Nu) and frictional penalty (f). In comparison to smooth duct, 5.57 times higher Nusselt number is obtained along with increase of frictional penalty by 4.46 times at number of gaps (N g ) of 3. The domination of Nusselt number (Nu) over frictional penalty (f) resulted tremendous increment in thermo-hydraulic performance (TPP) with the highest value of 3.46 at N g = 3 and relative-roughness-width (g/e) = 1.0.
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Effect of phyllanthus emblica biodiesel based lubricant on cylinder liner and piston ring
Paramvir Singh,Varun Goel,S. R. Chauhan 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.3
In the present time, need of biogenic lubricants is the focusing area which will be biodegradable, avirulent and eco-friendly. Current experimental tests depict the effect of ‘Phyllanthus emblica’ a non-edible feedstock through pin on disc tribo tester. Tests were conducted to evaluate the impact of 0, 10, 20 and 30 % blending of Phyllanthus emblica with SAE20W40 lubricating oil on cylinder liner and piston ring. Promising result have been manifested with 10 % blending of biodiesel (BD) with lubricating oil in terms of coefficient of friction and specific wear rate in comparison with other examined feedstock. For analysis of wear debris in the used oil analytical ferrography was also done. The effects of temperature on wear and friction characteristics have also been discussed.
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Rajneesh Kumar,Varun Goel,Anoop Kumar,Sourabh Khurana,Paramvir Singh,Santosh B. Bopche 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
The Computational fluid dynamics (CFD) based analysis is carried out to investigate the thermal and hydraulic performance of circular rib roughened triangular passage Solar air heater (SAH). The circular ribs were provided over the absorber plate. The roughness parameter such as relative roughness pitch (P/e) and relative roughness height (e/D) varies from 4 to 20 and 0.015 to 0.06 (in four sets), respectively, the Reynolds number (Re) varies from 4000 to 18000. The flow governing equations were solved using commercial ANSYS (Fluent) software. The predicted Nusselt number (Nu) and friction factor (f) are validated with the available experimental results. The thermal and hydraulic performance of roughened duct is estimated in the form of Nusselt number and friction factor, respectively. The Thermohydraulic performance parameter (TPP) is also evaluated depending on the friction factor (f) and Nusselt number (Nu) values for SAH. The maximum Thermohydraulic performance parameter (TPP) is observed at Reynolds number of 15000 in case of relative roughness pitch (P/e) and relative roughness height (e/D) value of 12 and 0.06, respectively.
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