Heat transfer between horizontal finned tubes and a gas-solid fluidized bed

Autor:	Nanak S. Grewal, Tak K. Cheung, Satish C. Saxena
Rok vydání:	1985
Předmět:	Fluidized bed Chemistry Heat transfer General Engineering Mineralogy Tube (fluid conveyance) General Medicine Particle size Mechanics Thermal conduction Fin (extended surface) Volumetric flow rate Shell and tube heat exchanger
Zdroj:	Industrial & Engineering Chemistry Process Design and Development. 24:458-471
ISSN:	1541-5716 0196-4305
DOI:	10.1021/i200029a042
Popis:	The heat-transfer coefficients are measured between electrically heated V-thread tubes and square fluidized beds of alumina and silica sand. The effect of particle size, mass fluidizing velocity, V-thread pitch, and tube pitch on the heat transfer rate is investigated. One-dimensional and two-dimensional heat conduction models are developed for determining the temperature distribution in a V-thread fin. The models are used to calculate the corrected heat-transfer coefficients for the finned tubes. A correlation for the fin effectiveness factor is proposed and is found to be reliable to predict its value for finned tubes with geometry and orientation similar to that in the present investigation. The correlation in conjunction with the existing correlatins for the heat-transfer coefficient for smooth tubes is found, in general, to predict the coefficients for finned tubes immersed in a fluidized bed within + or - 25%.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1fc3dcfab87f73b02bff2bf0c83097df https://doi.org/10.1021/i200029a042 Zobrazit plný text záznamu