@article{oai:jaxa.repo.nii.ac.jp:00031708,
 author = {服部, 直三 and 小竹, 進 and HATTORI, Naozo and KOTAKE, Susumu},
 issue = {1_A},
 journal = {東京大学宇宙航空研究所報告},
 month = {Feb},
 note = {水平単管および二重円管内の発達した層流強制対流熱伝達について実験的研究をおこない,自然対流の熱伝達特性におよぼす影響を定量的に明らかにした.これらの結果,代表温度Tr,内外管の加熱量の相対的大きさを加味した代表長さLrおよび代表速度Urとして, Tr=WGL^2r/α, Lr=(d^2_2-d^2_1)(q_1+q_2)/(d_1q_1+d_2q_2), Ur=ν/Lrを用いたグラスホフ数Gr, Gr=βgL_rT_r/U^2_rを用いると,自然対流の2次流れによる外管および内管壁の熱伝達特性は加熱割合に関係なくそれぞれ, Nuo=0.38G_r^<0.20>P_r^<0.28> Nui=0.44 G_r^<0.20>P_r^<0.28>(d_2/d_1)^<0.35>で表わせることがわかった., Experimental investigations have been made of the forced-convection heat-transfer for fully developed laminar flow in horizontal circular tubes and concentric annuli in order to clarify quantitatively the effect of free convection on their heat-transfer characteristics. When the Grashof number Gr = βgLrTr/Ur^2, defined by using Tr=WGLr^2/α, Lr=(d_2^2-d_1^2)(q_1+q_2)/(d_1q_1+d_2q_2), Ur=ν/Lr as the characteristic temperature, length and velocity, is introduced, the heat-transfer characteristics due to the secondary flows induced by free convection can be expressed by the following equations; Nuo = 0.38 Gr^<0.20>Pr^<0.28> for outer tubes Nui = 0.44Gr^<0.20>Pr^<0.28>(d_2/d_1)^<0.35> for inner tubes These two equations can be applied for horizontal circular tubes and annuli, regardless of heating amounts of inner and outer tubes., 資料番号: SA0124729000},
 pages = {19--34},
 title = {発達した水平二重円管内層流流れの自然・強制混合対流熱伝達},
 volume = {13},
 year = {1977}
}