Flow resistance characteristics of water in narrow annulus during heat exchange

Autor:	Qing-hua Zhang, Zhong-ning Sun, Changqi Yan, Li-cheng Sun
Rok vydání:	2003
Předmět:	Mass flux Materials science Turbulence Mechanical Engineering Flow (psychology) Reynolds number Thermodynamics Ocean Engineering Laminar flow Mechanics symbols.namesake Heat exchanger Annulus (firestop) symbols Tube (fluid conveyance)
Zdroj:	Journal of Marine Science and Application. 2:41-44
ISSN:	1993-5048 1671-9433
DOI:	10.1007/bf02935574
Popis:	Considering the special resistance characteristics of fluids flowing through ducts with small gaps, experiments are performed to investigate the resistance characteristics of single-phase water, which is forced to flow through vertical annuli. The gap sizes are 0.9, 1.4 and 2.4mm, respectively. The experiments are conducted under condition of 1 atm. The water in the annuli is heated by high temperature water reversely flowing through the inner tube and the outer annulus. The results show that the flow pattern begin to change from laminar to turbulent before Reynolds number approaches 2000, the flow resistance in annulus has little relations with the temperature difference and ways of being heated, but mainly depends on the ratio of mass flux to the width of annulus.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::131688cfde77332a650788f324f2db62 https://doi.org/10.1007/bf02935574 Zobrazit plný text záznamu Full text from SpringerLink