TY - JOUR
T1 - Radius ratio effects on natural heat transfer in concentric annulus
AU - Alipour, M.
AU - Hosseini, R.
AU - Kolaei, Alireza Rezania
PY - 2013
Y1 - 2013
N2 - This paper studies natural convection heat transfer in vertical and electrically heated annulus. The metallic cylinders mounted concentrically in a parallel tube. Measurements are carried out for four input electric powers and three radius ratios with an apparatus immersed in stagnant air. This experimental work develops correlations of the average Nusselt number dependency on the Rayleigh number in the annulus, where this dependency promotes as the radius ratio increases from 0.1 to 0.2. Moreover, a correlation is proposed to determine the average Nusselt number based on the variation of the radius ratio, the annulus aspect ratio, and the Rayleigh number.
AB - This paper studies natural convection heat transfer in vertical and electrically heated annulus. The metallic cylinders mounted concentrically in a parallel tube. Measurements are carried out for four input electric powers and three radius ratios with an apparatus immersed in stagnant air. This experimental work develops correlations of the average Nusselt number dependency on the Rayleigh number in the annulus, where this dependency promotes as the radius ratio increases from 0.1 to 0.2. Moreover, a correlation is proposed to determine the average Nusselt number based on the variation of the radius ratio, the annulus aspect ratio, and the Rayleigh number.
KW - Natural convection
KW - Experimental investigation
KW - Vertical concentric annulus
KW - Radius ratio
UR - http://www.scopus.com/inward/record.url?scp=84878954571&partnerID=8YFLogxK
U2 - 10.1016/j.expthermflusci.2013.04.011
DO - 10.1016/j.expthermflusci.2013.04.011
M3 - Journal article
SN - 0894-1777
VL - 49
SP - 135
EP - 140
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
ER -