Study on flow-pattern identification method using pressure drop characteristics of gas-liquid flow in narrow channel

To clarify flow-pattern of gas-liquid two-phase flow in narrow channel is important because flow-pattern of gas-liquid two-phase flow relates closely to better working of industrial products like polymer electrolyte fuel cell (PEFC), µ-TAS, small size of fuel assembly, or cooling system of small electronic devices. Moreover, gas-liquid two-phase flow in narrow channel is different from that in usual size channel, including standard inch pipe, better knowledge of flow-pattern leads to more performance and operating safety in such products. However, flow-pattern has been mostly identified to observe visible image. Therefore, it is necessary to identified flow-pattern without making inside visible because of safety or cost performance. As the identification of flow-pattern method, it uses us pressure drop fluctuations in narrow channel.