PERFORMANCE AND FLOW CHARACTERISTICS OF NOZZLES FOR INITIALLY SUBCOOLED HOT WATER (INFLUENCE OF TURBULENCE AND DECOMPRESSION RATE)

Material type: 文書・図像類

Author: OHTA, Jほか

Publisher: Elsevier

Publication date: 1993-02

Material Format: Digital

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Note (General)：: The purpose of this study was to improve the performance characteristics of a convergent-divergent nozzle for flashing expansion of initially subcoole...

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Material Type: 文書・図像類
Title: PERFORMANCE AND FLOW CHARACTERISTICS OF NOZZLES FOR INITIALLY SUBCOOLED HOT WATER (INFLUENCE OF TURBULENCE AND DECOMPRESSION RATE)
Author/Editor: OHTA, J
FUJII, T
AKAGAWA, K
TAKENAKA, N
Author Heading: OHTA, J
FUJII, T
AKAGAWA, K
TAKENAKA, N
Publication, Distribution, etc.: Elsevier
Publication Date: 1993-02
Publication Date (W3CDTF): 1993-02
Periodical title: INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
No. or year of volume/issue: 19 1
Volume: 19
Issue: 1
Pages: 125-136
Text Language Code: eng
Subject Heading: flashing
critical flow rate
thrust coefficient
convergent-divergent nozzle
decompression rate
pressure undershoot
Target Audience: 一般
Note (General): The purpose of this study was to improve the performance characteristics of a convergent-divergent nozzle for flashing expansion of initially subcooled hot water. The slip between the vapor and liquid along the divergent passage and the maximum nonequilibrium pressure drop at the nozzle throat(this is related to the thermal nonequilibrium) cause a decline in the nozzle efficiency. To decrease the maximum pressure drop,a nozzle with thin wires just upstream of the throat and a nozzle with a smaller convergent angle were manufactured and tested. Initially subcooled hot water at an inlet pressure of 0.47MPa and inlet temperatures of 409.9 to 421.8K (inlet subcoolings of 0.9-12.9K) were used with the nozzle back pressures ranging from 5 to 101.3kPa. The following results were attained:(1)the maximum nonequilibrium pressure drop at the throat decreased and the thrust coefficient increased by 10%; (2)the thrust coefficient was found to be independent of the inlet subcooling and exit stream-expansion ratio; (3)a correlation between the ratio of the exit pressure to the inlet pressure and the appropriate exit stream-expansion ratio was obtained empirically;and (4)the critical flow rate was found to be lower than that for an ordinary convergent-divergent nozzle.
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ