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NUMERICAL STUDY OF MIXED CONVECTION IN VERTICAL PIPE FLOWS WITH INLET FLOW RATE STEP. APPLICATIONS TO WATER RADIATORS

DOI: 10.1615/ICHMT.1996.TransientConvHeatTransf.260

Ton Hoang Mai
Laboratoire GRESPI - Thermomécanique, Faculté des Sciences PB1039, 51687 Reims, France

Nadim El Wakil
Laboratoire de Thermomécanique - UTAP Moulin de la housse, Faculté des Sciences, Université de Reims Champagne Ardenne, B.P. 1039, 51687 Reims cedex 2, France

Jacques Padet
Laboratoire de Thermomécanique - UTAP Moulin de la housse, Faculté des Sciences, Université de Reims Champagne Ardenne, B.P. 1039, 51687 Reims cedex 2, France

Résumé

In this paper we study a transient mixed convection problem. We consider a water flow in a vertical tube, submitted to a flow rate step. The characteristics of the transient velocity and temperature fields have been investigated numerically by a finite-difference procedure. The simulations have been performed with positive or negative steps. It is shown a dissymetry in the response of the system which can be characterized by two parameters: time lag and time constant. A strong difference in the temporal distributions of velocity and temperature profiles between these two cases, is also observed.

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