Heat Transfer in Micro-Channels and Dryout

The quasi-steady-state analysis approach to the dryout problem 

The important reason for the quasi-steady-state approach arises from the difficulty in obtaining a solution to the transient convection problem for two-phase situations. 

We will discuss the question in terms of the interface between the two-phase liquid (liquid-gas) and the wall. For this, consider the transient local heat flux as 

When G = x = 0,P and 7J are constant, the total derivative of (5.29) with respect to time can be written as  

This equation has been discussed by Nelson and Pasamehmetoglu (1992) relative to the application of the quasi-steady-state model for the convection problem. 

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