Comparative evaluation of the performance of sinuous symmetrically-heated natural convection channels

Journal ar
International Communications in Heat and Mass Transfer
  • Volumen: 55
  • Fecha: 01 January 2014
  • Páginas: 15-21
  • ISSN: 07351933
  • Source Type: Journal
  • DOI: 10.1016/j.icheatmasstransfer.2014.03.007
  • Document Type: Article
  • Publisher: Elsevier Ltd
Buoyancy-driven flows established in vertical channels are investigated numerically. Two different sinuous morphologies for a vertical channel are proposed as alternatives to a typical (straight) vertical channel; one is a sinus-shaped channel, and the other is a three-segment channel. The objective is to carry out a comparative evaluation of the thermal and dynamic performance of the proposed configurations, comparing their performance with that corresponding to a typical vertical channel. The low-Reynolds k-¿ turbulence model is employed to simulate the transitional or fully turbulent flow. The average Nusselt number and the dimensionless mass flow rate are obtained for Rayleigh numbers ranging 102¿RaH¿1015, with an aspect ratio of the channel equal to 0.1. Sizeable increases in the Nusselt number and the mass flow rate are found for the sinuous configurations, under given conditions. © 2014.

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