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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Study of the Heat Transfer and Flow Characteristic of an Ultra Micro Steam Injector

Get access (open in a dialog) DOI: 10.1615/IHTC15.cds.009895
pages 846-857

Sinopsis

It is suggested that a steam injector (SI) applied to heat pump systems to downscale them. SI is a passive jet pump which operates without rotating power source or machinery and it has high heat-transfer performance due to the direct contact condensation between steam flow and subcooled water jet. And it is expected that these features reduce the total system energy. The objective of the present study is to investigate the heat transfer flow characteristics of an ultra micro steam injector (UMSI) with throat diameter of 600 ????m in order to develop the further small SI. In the present study, we conducted observation of a visible test section with a high speed video camera. In addition, pressure was measured via a pressure gauge which synchronized with the high speed camera. The main parameters are inlet steam pressure, inlet water flow rate, inlet water temperature and outlet sectional area ratio between water nozzle and steam nozzle. As a result, the water jet which is one of the operating conditions was observed in the mixed nozzle of UMSI, and the possibility of the operation of UMSI was suggested. Furthermore, the pulsating flow which repeats collapse and reformation was observed after water jet formation. Those factors were experimentally considered in order to approach the operation of UMSI.