Combined forced and natural convective heat transfer from spheres at small reynolds number.

• YAMANAKA AKTHIRO

  Department of Nuclear Engineering, Kyushu University

• YUKI TOYOKI

  Department of Nuclear Engineering, Kyushu University

• MITSUISHI NOBUO

  Department of Nuclear Engineering, Kyushu University

抄録

Experiments on heat transfer from spheres to liquids have been carried out in the range of 2.0×10^-4<Re<900, 7.0<Pr<2.4×10⁴ and 5.7×10^-3<Gr<10⁷ for combined convection. A sphere, 46.03 mm in diameter, composed of eleven copper segments, and two brass spheres (19.03 and 9.534 mm in diameter) have been used. Test liquids used were 0.96%, 2.59%, 2.62% CMC aqueous sol. and 0.69%, 0.97%, 1.07% MC (methylcellulose) aqueous sol. The experimental data are summarized by the following relation:<br> Nu_m-2 = [{(126Re+57Re^3/2)Pr^1/3/(1+52Re^1/2+100Re)}^3/2 + (0.44Gr^1/4Pr^1/4)^3/2]^2/3(μ_b/μ_s)^1/4 where μ_b is the viscosity at the bulk liquid temperature t_b and μ_s is the viscosity at the sphere surface temperature t_s. This equation has been shown to represent measured values of Nu_m within an average deviation of 13.6 per cent.

収録刊行物

• JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

  JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 9 (6), 445-449, 1976

  公益社団法人 化学工学会

キーワード

• General Chemical Engineering
• General Chemistry

詳細情報

• CRID: 1390282679544867968
• NII論文ID: 130000784978
• DOI: 10.1252/jcej.9.445
• COI: 1:CAS:528:DyaE2sXhslemtLg%3D
• ISSN: 18811299
• ISSN: 00219592
• Web Site: http://www.jstage.jst.go.jp/article/jcej1968/9/6/9_6_445/_pdf
• 本文言語コード: en
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