http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Amit Dhiman (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Non-Newtonian power-law flow across a confined triangular bluff body in a channel
Amit Kumar Dhiman,Shailesh Kumar 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
Wall effects on the flow of incompressible non-Newtonian power-law fluids across an equilateral triangular cylinder confined in a horizontal plane channel have been investigated for the range of conditions: Reynolds number,Re=1-40, power-law index, n=0.4-1.8 (covering shear-thinning, Newtonian and shear-thickening behaviors) and blockage ratio=0.125-0.5. Extensive numerical results on flow pattern, wake/recirculation length, individual and overall drag coefficients, variation of pressure coefficient on the surface of the triangular cylinder and so forth are reported to elucidate the combined effect of power-law index, blockage ratio and Reynolds number. The size of vortices decreases with an increase in the value of the blockage ratio and/or power-law index. For a fixed value of the Reynolds number, individual and overall drags decrease with decrease in power-law index and/or blockage ratio in steady confined flow regime. Simple correlations of wake length and drag are also obtained for the range of settings considered.
-
Neha Sharma,Amit Dhiman,Surendra Kumar 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
Power-law shear-thinning fluid flow over a heated square bluff body is numerically investigated underaiding buoyancy mixed convection at low Reynolds numbers. Semi-explicit finite volume code is developed to solvethe governing equations along with the appropriate boundary conditions. Both aiding buoyancy and shear-thinningnatures are found to augment the heat transfer rate from the surface of the long square bar. In aiding buoyancy, thetotal drag coefficient is found to be more for the square cylinder than that of the circular cylinder, whereas the averagecylinder Nusselt number for the square cylinder is found to be lower than the circular one on equal side/diameter basis. Maximum augmentation in heat transfer is found to be approximately 20% with respect to forced convection. Finally, aheat transfer correlation is established by using the Colburn heat transfer factor.
-
Effect of alumina nanoparticle shape in a triangular porous array of heated periodic pin-fins
Mohd Asif,Amit Kumar Dhiman 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4
Forced convective flow of alumina-water nanofluid with different shapes of nanoparticles through pin-fins of circular cross-section aligned in an equilateral triangular array was analyzed using finite volume methodology. The effect of the shape of alumina nanoparticles on heat transfer across the periodic equilateral triangular array has never been studied in the past. Four different shapes of nanoparticles were considered: spherical, cylindrical, bricks, and platelets. Using non-spherical (cylindrical, bricks, and platelets) nanoparticles resulted in a thinning thermal boundary layer, which resulted in a significant enhancement in heat transfer rates across the array. The mean Nusselt number was augmented by 22% when platelet shaped nanoparticles were utilized in place of spherical shaped nanoparticles. Likewise, the mean Nusselt number was augmented by 17% when cylindrical nanoparticles were used, in place of spherical nanoparticles, at the highest values of other parameters. The increment in effective viscosity of the nanofluid was the highest for platelet-shaped nanoparticles, which resulted in a greater pressure drop compared to other shapes of nanoparticles such as cylindrical, bricks, and spherical for all values of particle concentration. The results in the present article are validated extensively with accessible experimental and numerical studies.
-
Experimental investigation on effects of dielectric mediums in near-dry electric discharge machining
Krishnakant Dhakar,Akshay Dvivedi,Amit Dhiman 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.5
A dielectric fluid plays a significant role on the machining efficiency of Electric discharge machining (EDM). Two phase (liquid-air) dielectric medium was utilized in near-dry (EDM). It is an environmentally friendly process. The present article reports the effect of different dielectric mediums on responses of near-dry EDM. Dielectric mediums used for experimentation were water-air, EDM oil-air and glycerin-air mixtures. The process parameters selected for experimentation were current, duty factor, flushing pressure and lift. Material removal mechanism of near-dry EDM is investigated using imaging techniques. Dielectric fluid with higher viscosity and higher Prandtl number provided better results than fluids with lower viscosity. The results reveal that the Material removal rate (MRR) with glycerin-air dielectric medium is about three-times higher than other dielectric medium used with negligible recast layer. The tool wear rate is negligible in near-dry EDM in relation to all the dielectric mediums.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
