AN EMPIRICAL CORRELATION FOR NATURAL CONVECTION FROM CONFINED ELLIPTIC TUBE

Autor:	M. Amiri, Mehdi Ashjaee, Tooraj Yousefi, Behzad Baghapour
Rok vydání:	2007
Předmět:	Materials science Natural convection Thermodynamics Heat transfer coefficient Mechanics Rayleigh number Nusselt number Physics::Fluid Dynamics symbols.namesake Control and Systems Engineering Heat transfer symbols Tube (fluid conveyance) Electrical and Electronic Engineering Rayleigh scattering Adiabatic process Instrumentation
Zdroj:	Experimental Heat Transfer. 20:213-228
ISSN:	1521-0480 0891-6152
DOI:	10.1080/08916150701229675
Popis:	An experimental study was conducted to obtain a correlation for free convection heat transfer from isothermal elliptic tubes of minor to major axis ratios of ∈ = 0.53, 0.67, 0.8, and 1 confined between two adiabatic walls. Local and average Nusselt numbers were determined for several different tube axis ratios, Rayleigh numbers, and wall spacings by means of the Mach-Zehnder Interferometery (MZI) technique. For each tube axis ratio, the Rayleigh number varied from 1,000–2,750 and the wall spacing to tube minor axis ratio from 1.25–∞. For all the tube axis ratios, the periphery and length of the tubes were kept constant. Experimental data are presented with a correlation which gives the average Nusselt number as a function of the tube axis ratio, Rayleigh number, and wall spacing to tube minor axis ratio. As the tube axis ratio decreases the average heat transfer coefficient increases. Also, for a constant Rayleigh number and tube axis ratio there is an optimum wall spacing which maximizes the heat transfe...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::37b9e7338e287363967981050600f66f https://doi.org/10.1080/08916150701229675 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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