ARTICLE:

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

T. H. Mai
Laboratoire de Thermomécanique, UTAP, Faculte des Sciences, BP 1039, 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

ABSTRACT

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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