Journal
CHINESE JOURNAL OF PHYSICS
Volume 56, Issue 4, Pages 1497-1507Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cjph.2018.06.006
Keywords
Center heater; Heat source; Nanofluid; Natural convection; Square enclosure
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A numerical study on natural convective heat transfer inside an enclosure with center heater using nanofluid has been carried out. The effect of different length of center heater on the flow and temperature fields is analysed for different Rayleigh numbers. Results are displayed in terms of streamlines, isotherms, mid height velocity profile and average Nusselt number. The numerical results reveal heat transfer increases with increasing heater length at both vertical and horizontal positions for increasing values of Rayleigh numbers. In particular, a higher increase in heat transfer is obtained with heater situated with vertical position of maximum length. Also it is obtained that enhancement of heat transfer is high for Ag - water nanofluid than CuO -water and Al2O3 -water nanofluids.
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