Heat Transfer on the Surface of a Roughend Plate

Autor:	Sugao Sugawara, Takashi Sato
Rok vydání:	1952
Předmět:	Materials science Turbulence Prandtl number Thermodynamics Film temperature Nusselt number Physics::Fluid Dynamics symbols.namesake Boundary layer Classical mechanics Heat transfer symbols Surface roughness Turbulent Prandtl number
Zdroj:	Transactions of the Japan Society of Mechanical Engineers. 18:1-6
ISSN:	2185-9485 0029-0270
DOI:	10.1299/kikai1938.18.76_1
Popis:	This is an approximate theoretical analysis with regard to surface heat transfer on a rough surface plate. From our experimental results, we assumed that the velocity distribution of the turbulent layer in turbulent boundary layer which was influenced by the surface roughness, was expressed by the following relation. [numerical formula] Where n is a function of the surface roughness. And, by assuming the existence of the viscous layer, we obtained the velocity and temperature-distribution in boundary layer, and moreover surface heat transfer coefficient. The result is as follows : -Nu/(R6)=k2/((n+2)2)/{1+(σ-1)[n(n+2)3/(k4(n+1))Re-1]1/(n-1) Where Nu is Nusselt's number, Re is Reynolds' number and σ is Prandtl's number. This result agrees well with our experimental results performed by using air.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::942811635cc47bdeea681662bef8f4f8 https://doi.org/10.1299/kikai1938.18.76_1 Zobrazit plný text záznamu