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Vol.2 , No. 1, Publication Date: Feb. 13, 2015, Page: 1-11
 in the case of one hole for the exit air from the top, and for an average Nusselt number range (mode-b) in the case of two holes for the exit air from the top. The experimental results show that the average Nusselt number inversely proportional with Rayleigh number for high heater power values. The average Nusselt number increases with the increase of Reynolds number for the first case.&picture=http://www.aascit.org/aascit/decorators/img/journal/925.jpg)
| [1] | Laith Jaafer Habeeb, University of Technology, Mechanical Engineering Department, Baghdad, Iraq. |
| [2] | Wahid Shati Mohammad, University of Technology, Mechanical Engineering Department, Baghdad, Iraq. |
| [3] | Maher Abdalrazaq Rashed, University of Technology, Mechanical Engineering Department, Baghdad, Iraq. |
This paper represents an experimental investigation of forced and free convection heat transfer for three dimension laminar steady flows in three-dimensional space as rectangular box. The experiments include a study of the effect of forced and free convection heat transfer and the effect of the position of the two parallel heated plates in an enclosure. This experimental work includes two cases: First case: represents the study of heat transfer characteristics by forced convection for the exit air from the top circular hole for Reynolds number range at all power range. The results show that the average Nusselt number increases with increase of the power. Second case: represents the study of heat transfer characteristics by free convection for the entry of the air from the circular hole on the bottom face of the box and the exit air is from the circular one hole or two holes of the top face of the box for an average Nusselt number range (mode-a) in the case of one hole for the exit air from the top, and for an average Nusselt number range (mode-b) in the case of two holes for the exit air from the top. The experimental results show that the average Nusselt number inversely proportional with Rayleigh number for high heater power values. The average Nusselt number increases with the increase of Reynolds number for the first case.
Keywords
Free and Forced Convection, Rectangular Box, Parallel Heated Plates, Vertical and Horizontal Heaters
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