Annual Reviews of Heat Transfer

ISSN 1049-0787

Year 1994

Volume 5

458 pages

Volume price - $141.00

Zeng-Yuan Guo
Department of Engineering Mechanics, Education Ministry Key Lab of Enhanced Heat Transfer and Energy Conservation, Tsinghua University, Beijing 100084, China

The influence of thermal process on fluid flow as a class effect has been studied systematically and profoundly. It can be summarized into the following:

1. Thermal Drag (thermally induced pressure drop) is, in some cases, of great influence on flow properties, such as mass flow rate, and heat transfer, etc. With the aid of the definition and analytical expression of the thermal drag coefficient, it is possible to predict the pressure drop and critical heat flux of gas single phase flow and gas-liquid two-phase flow in the channel under heating in a very simple way.
2. Thermal Displacement (thermally induced fluid displacement) is described analytically and numerically using the concept of "false source" and "thermal dipole". Their applications cover the dust remover, particle collector, and control of mass flow distribution in thermal devices.
3. Thermal Drive (thermally induced fluid motion) can appear in miscellaneous force fields, for instance, centrifugal and surface tension as well as in gravitational field. The origin of the flow and the consequent effects including the heat transfer enhancement, environmental pollution, and increase in isotope separation efficiency are emphasized.
4. Thermal Instability (thermally induced hydrodynamic instability) will be discussed in terms of its physical mechanism. Various dynamic approaches are used to obtain the critical criterion of instability which is important for material processing, drag reduction, and thermal pollution of water sources.

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