Laminar heat transfer enhancement downstream of a backward facing step by using a pulsating flow

Velázquez López, Ángel Gerardo; Arias Pérez, Juan Ramón y Mendez, B. (2008). Laminar heat transfer enhancement downstream of a backward facing step by using a pulsating flow. "International Journal of Heat and Mass Transfer", v. 51 (n. 7-8); pp. 2075-2089. ISSN 0017-9310. https://doi.org/10.1016/j.ijheatmasstransfer.2007.06.009.

Descripción

Título: Laminar heat transfer enhancement downstream of a backward facing step by using a pulsating flow
Autor/es:
  • Velázquez López, Ángel Gerardo
  • Arias Pérez, Juan Ramón
  • Mendez, B.
Tipo de Documento: Artículo
Título de Revista/Publicación: International Journal of Heat and Mass Transfer
Fecha: Enero 2008
Volumen: 51
Materias:
Palabras Clave Informales: Back; step; unsteady; laminar; pulsatin
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Motopropulsión y Termofluidodinámica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

Texto completo

[img]
Vista Previa
PDF (Document Portable Format) - Se necesita un visor de ficheros PDF, como GSview, Xpdf o Adobe Acrobat Reader
Descargar (1MB) | Vista Previa

Resumen

This study is motivated by the need to devise means to enhance heat transfer in configurations, like the back step, that appear in certain types of MEMS that involve fluid flow and that are not very efficient from the thermal transfer point of view. In particular, the work described in this paper studies the effect that a prescribed flow pulsation (defined by two control parameters: velocity pulsation frequency and pressure gradient amplitude at the inlet section) has on the heat transfer rate behind a backward facing step in the unsteady laminar 2-D regime. The working fluid that we have considered is water with temperature dependent viscosity and thermal conductivity. We have found that, for inlet pressure gradients that avoid flow reversal at both the upstream and downstream boundary conditions, the timeaveraged Nusselt number behind the step depends on the two above mentioned control parameters and is always larger than in the steady-state case. At Reynolds 100 and pulsating at the resonance frequency, the maximum time-averaged Nusselt number in the horizontal wall region located behind the step whose length is four times the step height is 55% larger than in the steady-case. Away from the resonant pulsation frequency, the time-averaged Nusselt number smoothly decreases and approaches its steady-state value.

Más información

ID de Registro: 2246
Identificador DC: http://oa.upm.es/2246/
Identificador OAI: oai:oa.upm.es:2246
Identificador DOI: 10.1016/j.ijheatmasstransfer.2007.06.009
URL Oficial: http://www.elsevier.com/wps/find/journaldescription.cws_home/210/description#description
Depositado por: Memoria Investigacion
Depositado el: 19 May 2010 08:12
Ultima Modificación: 20 Abr 2016 11:59
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Compruebe si la revista anglosajona en la que ha publicado un artículo permite también su publicación en abierto.
  • Dulcinea
    Compruebe si la revista española en la que ha publicado un artículo permite también su publicación en abierto.
  • Recolecta
  • e-ciencia
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM