Composite relation for laminar free convection in inclined channels with uniform heat flux boundaries

Autor:	Jane H. Davidson, Gur Mittelman, Aiman Alshare
Rok vydání:	2009
Předmět:	Fluid Flow and Transfer Processes Physics Natural convection Mechanical Engineering Thermodynamics Geometry Laminar flow Rayleigh number Condensed Matter Physics Nusselt number Pipe flow Heat flux Flow conditioning Heat transfer
Zdroj:	International Journal of Heat and Mass Transfer. 52:4689-4694
ISSN:	0017-9310
Popis:	A composite correlation of the average Nusselt number and the channel Rayleigh number for buoyant air flow through inclined channels with uniform heat flux boundaries is presented. The form of the correlation is based on dimensional analysis and is a superposition of the developing and fully developed flow limits. In the limit of fully developed flow, an analytical solution for the Nusselt number is derived. The developing flow limit follows the format of the correlation for a single plate. The composite relationship based on the top wall temperature is Nu ¯ = 6.25 ( 1 + r ) Ra ″ sin ϕ + 1.64 ( Ra ″ sin ϕ ) 2 / 5 - 1 / 2 , where r is ratio of the heat flux at the top and bottom wall. At inclination angles of 30 ° ≤ ϕ ≤ 90 ° , this correlation predicts the available data base for 10 ≤ Ra ″ ≤ 10 5 and agrees with the analytical solution for 1 ≤ Ra ″ ≤ 10 2 .
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ecf551c426b3f11615c2e6f889d7d54a https://doi.org/10.1016/j.ijheatmasstransfer.2009.06.003 Zobrazit plný text záznamu Full Text from ScienceDirect