Critical Heat Fluxes of Subcooled Water Flow Boiling against Inlet Subcooling in Short Vertical Tube

• HATA Koichi

  Institute of Advanced Energy, Kyoto Univ.

• KOMORI Hirokazu

  Dept. of Energy Science and Technology, Kyoto University

• SHIOTSU Masahiro

  Dept. of Energy Science and Technology, Kyoto University

• NODA Nobuaki

  National Institute for Fusion Science

抄録

The critical heat fluxes (CHFs) of subcooled water flow boiling for the test tube inner diameters (d=3 and 6mm) and the heated lengths (L=67, 120 and 150mm) are systematically measured for the flow velocities (u=4.0 to 13.3m/s), the inlet subcoolings (ΔT_{sub, in}=48 to 148K), the outlet subcoolings (ΔT_{sub, out}=10.5 to 95.1K), the inlet pressure (P_in=753 to 995kPa) and the outlet pressure (P_out=720 to 887kPa). The SUS304 tubes of L=67, 120 and 150mm for d=3mm and L=150mm for d=6mm are used. The values of L/d are 22, 40 and 50 for d=3mm, and 25 for d=6mm, respectively. The CHFs, q_{cr, sub}, for a fixed ΔT_{sub, out} become gradually lower with an increase in the L/d in the whole experimental range. The CHF correlation against outlet subcooling, which has been previously derived for L/d lower than 16, was modified to new one containing the L/d effect based on these experimental data. Furthermore, the relation between q_{cr, sub} and L/d for a fixed ΔT_{sub, in} was checked. The values of q_{cr, sub} for a fixed ΔT_{sub, in} became exponentially lower with the increase in L/d. CHF correlation against inlet subcooling has been given based on the experimental data for L/d ranging from 4.08 to 50. The correlations against outlet and inlet subcoolings can describe not only the CHFs obtained in this work for the inner diameter of 3 and 6mm at the outlet pressure of around 800kPa but also the authors' published CHFs data (1611 points) for the wide ranges of P_in=159kPa to 1MPa, d=3 to 12mm, L=33 to 150mm and u=4.0 to 13.3m/s within 15% difference for 30K≤ΔT_{sub, out}≤140K and 40K≤ΔT_{sub, in}≤151K.

収録刊行物

• JSME International Journal Series B Fluids and Thermal Engineering

  JSME International Journal Series B Fluids and Thermal Engineering 47 (2), 306-315, 2004

  一般社団法人 日本機械学会

キーワード

• Critical Heat Flux
• Subcooled Flow Boiling
• Inlet Subcooling
• Short Vertical Tube

詳細情報

• CRID: 1390001204674845824
• NII論文ID: 110004826617
• NII書誌ID: AA10888815
• DOI: 10.1299/jsmeb.47.306
• ISSN: 13475371
• ISSN: 13408054
• NDL書誌ID: 6939944
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6939944
• Web Site: http://www.jstage.jst.go.jp/article/jsmeb/47/2/47_2_306/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可