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Radiative Effects on Mixed Convection in a Uniformly Heated Vertical Convergent Channel with an Unheated Moving Plate

Published online by Cambridge University Press:  03 June 2015

Assunta Andreozzi ,
Nicola Bianco  and
Vincenzo Naso
Assunta Andreozzi*
Affiliation:
DETEC-Università di Napoli Federico II, P.le Tecchio, 80-80125, Napoli, Italy
Nicola Bianco*
Affiliation:
DETEC-Università di Napoli Federico II, P.le Tecchio, 80-80125, Napoli, Italy
Vincenzo Naso*
Affiliation:
DETEC-Università di Napoli Federico II, P.le Tecchio, 80-80125, Napoli, Italy
*
Corresponding author. URL: https://www.docenti.unina.it/assunta.andreozzi, Email: assunta.andreozzi@unina.it
Email: nicola.bianco@unina.it
Email: vincenzo.naso@u nina.it
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Abstract

Fluids engineering is extremely important in a wide variety of materials processing systems, such as soldering, welding, extrusion of plastics and other polymeric materials, Chemical Vapor Deposition (CVD), composite materials manufacturing. In particular, mixed convection due to moving surfaces is very important in these applications. Mixed convection in a channel, as a result of buoyancy and motion of one of its walls has received little research attention and few guidelines are available for choosing the best performing channel configuration, particularly when radiative effects are significant. In this study a numerical investigation of the effect of radiation on mixed convection in air due to the interaction between a buoyancy flow and an unheated moving plate induced flow in a uniformly heated convergent vertical channel is carried out. The moving plate has a constant velocity and moves in the buoyancy force direction. The principal walls of the channel are heated at uniform heat flux. The numerical analysis is accomplished by means of the commercial code Fluent. The effects of the wall emissivity, the minimum channel spacing, the converging angle and the moving plate velocity are investigated and results in terms of air velocity and temperature fields inside the channel and wall temperature profiles, both of the moving and the heated plates, are given. Nusselt numbers, both accounting and not for the radiative contribution to heat removal, are also presented.

Keywords

80M1280A20Mixed convectionmoving surfacesconvergent channelsradiative effects
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 3 , Issue 3 , June 2011 , pp. 280 - 296
Copyright
Copyright © Global-Science Press 2011

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