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Numerical investigation of mixed convection heat transfer behavior of nanofluid in a cavity with different heat transfer areas

Version 2 2024-06-12, 18:40
Version 1 2020-09-23, 11:51
journal contribution
posted on 2024-06-12, 18:40 authored by Shahrouz Yousefzadeh, Hamid Rajabi, Navid Ghajari, Mohammad Mohsen Sarafraz, Omid Ali Akbari, Marjan Goodarzi
The main purpose of this research is the numerical modeling of laminar mixed convection heat transfer inside an open square cavity with different heat transfer areas. In the considered geometry, cold fluid enters the cavity. At the middle of the cavity, there is a hot isothermal circular heat source. For increasing the heat transfer, solid silver nanoparticles with volume fractions (φ) of 0, 2 and 4% are added to water. Studied Re numbers are 10, 50, 120 and 200. The location of the hot zone changes the temperature distribution in the fluid layers. If the heat transfer area is located in an appropriate location, temperature distribution becomes more uniform. Increasing Re leads to smaller temperature gradients in regions near the hot surface and higher temperature at fluid layers close to the surface. By increasing fluid velocity, backflows do not improve heat transfer but it is able to change the heat transfer mechanism. By decreasing the fluid velocity, the effects of velocity gradients and extension of the velocity boundary layer increase and friction coefficient attains the maximum value.

History

Journal

Journal of Thermal Analysis and Calorimetry

Volume

140

Pagination

2779-2803

Location

Budapest, Hungary

ISSN

1388-6150

eISSN

1588-2926

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2019, Akadémiai Kiadó, Budapest, Hungary

Issue

6

Publisher

Akadémiai Kiadó