During the past year. Research on the flow in two States (Two-phase flow) of a substance R-134a cooling pipe in mini size, Chanel (Chanel Mini) has been very interested in engineering, because the enthalpy of evaporation the smaller. Flow boiling in mini size tube Chanel (Chanel Mini) can be applied to the system and power the process heat exchangers with high Heat flux values. Currently, there is rapid development of engineering equipment with smaller ones, such as a small heat exchange equipment. Cooling systems for computers or electronics. In a study of boiling flow characteristics of refrigerating substances R-134a in pipe diameter size 1 mm Test interval length 60 cm-length section, research and study in this study, characteristics of flow boiling in two States (Two-phase flow) of the cooling substance in a vertical suite.The flow characteristics, which have a significant variable gravity flow in vertical involves. By using a pipe size of 1 mm after the working substance flowing through the Pre-Heater range which makes the compounds work become the second State (Two-phase flow) model flow characteristics that occurs, it will result in heat transfer characteristics in channel flow change.
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