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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT TRANSFER AND FLOW CHARACTERISTICS OF ULTRA-MICRO STEAM INJECTOR AND ITS OPERATING CONDITION

Akihiro Futsuta
University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan

Akiko Kaneko
University of Tsukuba, Graduate School of System and Information Engineering, 1-1-1, Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan

Yutaka Abe
University of Tsukuba, Graduate School of System and Information Engineering, 1-1-1, Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan

Yutaka Suzuki
WELCON Inc., 15-1 Yashiroda, Akiha-ku, Niigata, Niigata, 956-0113, Japan

DOI: 10.1615/IHTC16.cod.023163
pages 2219-2225


Palavras-chave: Condensation, Two-phase/Multiphase flow, heat pump, steam injector, micro-order-scale

Resumo

A steam injector (SI) has capability to be applied to heat pump systems and be down sized them. A SI works as a passive jet pump without external power sources. Moreover, it has high heat-transfer performance due to direct contact condensation between steam flow and subcooled water jet. The objective of the present study is to clarify heat transfer and flow characteristics of an ultra-micro steam injector (UMSI) to develop a small SI. To the goal of the future SI, SIs with throat diameters of 1000 µm and 600 µm were designed and these were investigated experimentally. In the present study, internal flow was visualized by a high-speed video camera. Simultaneously, pressure and temperature were measured synchronized with the high-speed visualization. The main parameters were inlet steam pressure, inlet water mass flow rate, inlet water temperature, inlet cross-section ratio between a water nozzle and a steam nozzle, and diameter of a diffuser exit. As a result, the formation of the water jet and characteristics during operation were confirmed in UMSI. It was verified that discharged pressure became higher than the inlet pressure. In addition, the ratio between discharged pressure and inlet steam pressure was increased by changing the diffuser exit diameter with throat diameter of 1000 µm.

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