The nanofluid flows in the channel with linearly varying wall temperature

In many applications of heat exchanger, due to the heat convection, the wall temperature of the channel usually varies along the streamwise direction. The present paper reports the analysis of nanofluid flows in the channel with linearly varying wall temperature. The non-uniform equilibrium fluid me...

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Autores principales:	Kai-Xin Hu, Yan Huang, Xin-Yuan Zhang, Sheng Wang, Qi-Sheng Chen
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Nanofluids Poiseuille flow Heat transfer Nanoparticle concentration Viscosity stratification Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/31ba5c76e8e242029637f6b0e26445d0
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id	oai:doaj.org-article:31ba5c76e8e242029637f6b0e26445d0
record_format	dspace
spelling	oai:doaj.org-article:31ba5c76e8e242029637f6b0e26445d02021-11-04T04:30:56ZThe nanofluid flows in the channel with linearly varying wall temperature2214-157X10.1016/j.csite.2021.101602https://doaj.org/article/31ba5c76e8e242029637f6b0e26445d02021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2214157X21007656https://doaj.org/toc/2214-157XIn many applications of heat exchanger, due to the heat convection, the wall temperature of the channel usually varies along the streamwise direction. The present paper reports the analysis of nanofluid flows in the channel with linearly varying wall temperature. The non-uniform equilibrium fluid medium model proposed by Buongiorno is applied, where the Brownian diffusion and thermophoresis of nanoparticles are considered. The numerical solutions of laminar flows are determined by the iteration method in conjunction with the Chebyshev collocation method. The results show that: (1) there is a Gaussian distribution of nanoparticle concentration in the wall-normal direction for convective cooling, while its standard deviation depends on the Peclet number and the ratio of Brownian diffusivity to thermophoretic diffusivity; (2) there are obvious stratifications for the viscosity and thermal conductivity in the flow; (3) the velocity decreases significantly with the increase of nanoparticle concentration for convective heating, while there is only a little decrease for the velocity in the cold region for convective cooling.Kai-Xin HuYan HuangXin-Yuan ZhangSheng WangQi-Sheng ChenElsevierarticleNanofluidsPoiseuille flowHeat transferNanoparticle concentrationViscosity stratificationEngineering (General). Civil engineering (General)TA1-2040ENCase Studies in Thermal Engineering, Vol 28, Iss , Pp 101602- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Nanofluids Poiseuille flow Heat transfer Nanoparticle concentration Viscosity stratification Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Nanofluids Poiseuille flow Heat transfer Nanoparticle concentration Viscosity stratification Engineering (General). Civil engineering (General) TA1-2040 Kai-Xin Hu Yan Huang Xin-Yuan Zhang Sheng Wang Qi-Sheng Chen The nanofluid flows in the channel with linearly varying wall temperature
description	In many applications of heat exchanger, due to the heat convection, the wall temperature of the channel usually varies along the streamwise direction. The present paper reports the analysis of nanofluid flows in the channel with linearly varying wall temperature. The non-uniform equilibrium fluid medium model proposed by Buongiorno is applied, where the Brownian diffusion and thermophoresis of nanoparticles are considered. The numerical solutions of laminar flows are determined by the iteration method in conjunction with the Chebyshev collocation method. The results show that: (1) there is a Gaussian distribution of nanoparticle concentration in the wall-normal direction for convective cooling, while its standard deviation depends on the Peclet number and the ratio of Brownian diffusivity to thermophoretic diffusivity; (2) there are obvious stratifications for the viscosity and thermal conductivity in the flow; (3) the velocity decreases significantly with the increase of nanoparticle concentration for convective heating, while there is only a little decrease for the velocity in the cold region for convective cooling.
format	article
author	Kai-Xin Hu Yan Huang Xin-Yuan Zhang Sheng Wang Qi-Sheng Chen
author_facet	Kai-Xin Hu Yan Huang Xin-Yuan Zhang Sheng Wang Qi-Sheng Chen
author_sort	Kai-Xin Hu
title	The nanofluid flows in the channel with linearly varying wall temperature
title_short	The nanofluid flows in the channel with linearly varying wall temperature
title_full	The nanofluid flows in the channel with linearly varying wall temperature
title_fullStr	The nanofluid flows in the channel with linearly varying wall temperature
title_full_unstemmed	The nanofluid flows in the channel with linearly varying wall temperature
title_sort	nanofluid flows in the channel with linearly varying wall temperature
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/31ba5c76e8e242029637f6b0e26445d0
work_keys_str_mv	AT kaixinhu thenanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT yanhuang thenanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT xinyuanzhang thenanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT shengwang thenanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT qishengchen thenanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT kaixinhu nanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT yanhuang nanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT xinyuanzhang nanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT shengwang nanofluidflowsinthechannelwithlinearlyvaryingwalltemperature AT qishengchen nanofluidflowsinthechannelwithlinearlyvaryingwalltemperature
_version_	1718445266084823040

The nanofluid flows in the channel with linearly varying wall temperature

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