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标题：Study on the Vertical Wall Heat Transfer by Numerical Simulation of Non-Newtonion (Herschel-Bulkley Model) Nanofluid and Changes
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作者：S. Hashemi ; H. Shokouhmand
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2018
卷号：9
期号：5
页码：1418-1430
DOI：10.26872/jmes.2018.9.5.155
出版社：University of Mohammed Premier Oujda
摘要：As plate heat exchangers have numerous applications and there is a lot of heat exchangebetween solid surfaces and fluids in different industries, the investigation of the heatexchange of fluids with a constant wall heat flux boundary condition, can change anengineer’s view in designing heat exchangers including plate heat exchangers. Thisresearch deals with numerical investigation of the heat exchange of a nanofluid (with aNon-Newtonian base fluid which has the rheological behavior of Herschel-Bulkleymodel). As the application of nanofluids especially those with a Non-Newtonian basefluid (such as many lubricating oils whose cooling role in different machinery has beenregarded in recent decades) in the matter of heat exchange has not yet completely beenrecognized, thus, we preferred to use solid nanoparticles in the cooling process of thefluids so that with a growth in the thermal conductivity factor, the heat exchange ratefrom the fluid to the surface can be increased. In the recent years the use of nanofluidsfor increasing the heat exchange between fluids and solid surfaces of heat exchangershas become prevalent, so that nowadays in most heat exchange equipment, for a longerdurability of components and enhancing the heat exchange rate, different types ofnanofluids are utilized due to their high heat exchange factor. In investigating the heatexchange of nanofluids with a Newtonian base fluid (such as water) or Non-Newtonianbase fluid (such as different types of industrial oils) two different opinions exist, theassumption of single phase (fluid with solid nanoparticles) and the second is separationof fluid and nanoparticles as liquid and solid phases. Though with the correctdetermination of equivalent values for density, Viscosity, specific heat capacity andthermal conductivity for the single-phase status, we can obtain precise results and therewould be no need for a complicated and lengthy two-phase solution. In most papers, thesingle-phase assumption is considered.
关键词：Nanofluid;Herschel Bulkley;non;Newtonion;Convection;Vertical plate;Numerical simulation;