Local heat transfer coefficients in scraped-film heat exchanger

Autor:	Terrence W. Hoffman, Hisashi Miyashita
Rok vydání:	1978
Předmět:	Dynamic scraped surface heat exchanger NTU method Convective heat transfer Chemistry General Chemical Engineering Heat transfer Heat spreader Plate heat exchanger Thermodynamics General Chemistry Heat transfer coefficient Concentric tube heat exchanger
Zdroj:	JOURNAL OF CHEMICAL ENGINEERING OF JAPAN. 11:444-450
ISSN:	1881-1299 0021-9592
DOI:	10.1252/jcej.11.444
Popis:	The instantaneous heat transfer coefficients in a scraped-film heat exchanger have been determined using the electrochemical technique for a two-bladed, 78.7mm I.D. exchanger. The time-averaged local heat transfer coefficients were found to agree fairly well with previous work of Azoory and Bott, though some variation in liquid flow rate was detected. The timeaveraged local Nusselt number was found to be represented by Nu=Q.15(Rer•Pr)1/2Reawwith a=(l-3.74×10-2N)/9. The variation of heat transfer coefficient with time was observed to be very different from that predicted by the accepted model for the phenomena based upon unsteady state conduction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9fe197728b6e2ebff0bd3fe8864a92bf https://doi.org/10.1252/jcej.11.444 Zobrazit plný text záznamu