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Experimental Study of Mixed Convection Heat Transfer to Thermally Developing Air Flow in a Horizontal Rectangular Duct

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International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Year of Publication: 2021
Authors:
Yasin K. Salman, Jalal M. Jalil, Ahmed F. Khudheyer
10.5120/ijca2021921172

Yasin K Salman, Jalal M Jalil and Ahmed F Khudheyer. Experimental Study of Mixed Convection Heat Transfer to Thermally Developing Air Flow in a Horizontal Rectangular Duct. International Journal of Computer Applications 174(25):44-53, March 2021. BibTeX

@article{10.5120/ijca2021921172,
	author = {Yasin K. Salman and Jalal M. Jalil and Ahmed F. Khudheyer},
	title = {Experimental Study of Mixed Convection Heat Transfer to Thermally Developing Air Flow in a Horizontal Rectangular Duct},
	journal = {International Journal of Computer Applications},
	issue_date = {March 2021},
	volume = {174},
	number = {25},
	month = {Mar},
	year = {2021},
	issn = {0975-8887},
	pages = {44-53},
	numpages = {10},
	url = {http://www.ijcaonline.org/archives/volume174/number25/31833-2021921172},
	doi = {10.5120/ijca2021921172},
	publisher = {Foundation of Computer Science (FCS), NY, USA},
	address = {New York, USA}
}

Abstract

This paper describes the case of combined free and forced convection heat transfer to a thermally developing air flow in a horizontal rectangular duct which has been studied experimentally for laminar internal flow. The heated surfaces were subjected to a constant heat flux while the duct short sides were kept unheated, for three cases lower, upper side heated only and both sides heated with constant heat flux and for five-duct angles of inclination 0° (horizontal). In the experimental study, the heat flux applied to the heated surfaces varied from 40 to 400 W/m2. This provides a modified Grashof number varied from 2.38*106 to 2.8*108 respectively, while the Reynolds number varied from 800 to 2100. Surface temperature, local heat transfer results reveal a significant effect of buoyancy force created by natural convection on the heat transfer process with the buoyancy makes the thermal boundary layer developed early in comparison with pure forced convection.

References

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Keywords

Mixed Convection Heat Transfer, Thermally Developing flow, constant heat flux, horizontal Rectangular Duct