Recently microchannels or minichannels are widely used for cooling the high density power electronic devices. Especially, the channels are used in small and high efficient equipments such as heat pipes and heat exchangers. The interfacial behaviors between liquid and gas phases are very important to understand the flow characteristics in micro or minichannels. One of the problems at the CPL heat pipes is the backflow of vapor through the liquid line toward the evaporator. Therefore, we applied the converging minichannels at the condenser to avoid the backflow. In this paper, a numerical analysis on the interfacial velocities and the total pressures depending on variations of the converging rate and the depth of the minichannel was performed. And it was shown that the converging minichannel can reduce the backflow effect. Eventually the proper dimension of the minichannel to reduce the vapor backflow was found. In the numerical experiment, CFD-ACE+, a commercial program, was used.
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