Local energy balance, specific heats and the Oberbeck-Boussinesq approximation

被引：29

作者：

Barletta, A. ^{[1
]}

机构：

[1] Univ Bologna, DIENCA, I-40136 Bologna, Italy

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2009年 / 52卷 / 21-22期

关键词：

Oberbeck-Boussinesq approximation; Energy balance; Specific heat; Porous media; VISCOUS DISSIPATION;

D O I：

10.1016/j.ijheatmasstransfer.2009.06.006

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A thermodynamic argument is proposed in order to discuss the most appropriate form of the local energy balance equation within the Oberbeck-Boussinesq approximation. The study is devoted to establish the correct thermodynamic property to be used in order to express the relationship between the change of internal energy and the temperature change. It is noted that, if the fluid is a perfect gas, this property must be identified with the specific heat at constant volume. If the fluid is a liquid, a definitely reliable approximation identifies this thermodynamic property with the specific heat at constant pressure. No explicit pressure work term must be present in the energy balance. The reasoning is extended to the case of fluid saturated porous media. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：5266 / 5270

页数：5

共 18 条

[1]

[Anonymous], FLUID MECH

[2]

ARPACI VS, 1984, CONVECTION HEAT TRAN, P30

[3] Comments on a paradox of viscous dissipation and its relation to the Oberbeck-Boussinesq approach [J].