## Abstract

In Chap. 5 the available data related to flow and heat transfer of a gas–liquidmixture in single and parallel channels of different size and shape are presented. These data concern flow regimes, void fraction, pressure drop and heat transfer. The effects of different parameters on flow patterns and hydrodynamic and thermal characteristics of gas–liquid flow are discussed. Understanding the differences in two-phase flow characteristics between conventional size channels and micro-channels is also important for designing mini- or micro-heat exchangers, since the flow characteristics will affect the phase change heat transfer.

## Keywords

Void Fraction Multiphase Flow Liquid Bridge Liquid Velocity Frictional Pressure Drop
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