Pulsating flow and convective heat transfer in a cavity with inlet and outlet sections

Velázquez, A. and Arias Pérez, Juan Ramón and Montañés García, José Luis (2009). Pulsating flow and convective heat transfer in a cavity with inlet and outlet sections. "International Journal of Heat and Mass Transfer", v. 52 (n. 3); pp. 647-654. ISSN 0017-9310. https://doi.org/10.1016/j.ijheatmasstransfer.2008.07.020.

Description

Title: Pulsating flow and convective heat transfer in a cavity with inlet and outlet sections
Author/s:
  • Velázquez, A.
  • Arias Pérez, Juan Ramón
  • Montañés García, José Luis
Item Type: Article
Título de Revista/Publicación: International Journal of Heat and Mass Transfer
Date: January 2009
ISSN: 0017-9310
Volume: 52
Subjects:
Freetext Keywords: Cavity; Unsteady flow; Convective heat transfer
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper deals with the study of 2-D, laminar, pulsating flow inside a heated rectangular cavity with different aspect ratios. The cooling liquid (water with temperature dependent viscosity and thermal conductivity) comes and leaves the cavity via inlet and outlet ports. The flow topology is characterised by the large recirculation regions that exist at inner corners of the cavity. These low velocity regions cause the heat transfer to be small when compared, for instance, to that of a straight channel. We study the effect that a prescribed pulsation at the inlet port has on the cavity heat transfer. This pulsating boundary condition, of the unsteady Poiseuille type, is described by its frequency and the amplitude of the pressure gradient. The time averaged Reynolds number of the flow, based on the hydraulic diameter of the inlet channel, is 100 and we consider that the dimensionless pulsation frequency (Strouhal number) varies in the range from 0.0 to 0.4. We show that the prescribed pulsation enhances heat transfer in the cavity and that the mechanism that causes this enhancement appears to be the periodic change in the recirculation flow pattern generated by the pulsation. Regarding the quantitative extent of heat transfer recovery, we find that appropriate selection of the pulsation parameters allows for the cavity to behave like a straight channel that is the configuration with the highest Nusselt number.

More information

Item ID: 5953
DC Identifier: http://oa.upm.es/5953/
OAI Identifier: oai:oa.upm.es:5953
DOI: 10.1016/j.ijheatmasstransfer.2008.07.020
Official URL: http://www.sciencedirect.com
Deposited by: Memoria de Investigacion 2
Deposited on: 09 Feb 2011 12:15
Last Modified: 20 Apr 2016 14:37
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