水スプレーと高温金属試料間の熱伝達係数の数式化(計測・制御・システム技術)
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概要
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The author made four kinds of water spray cooling experiments to numerize heat transfer coefficient h between water spray and a heated specimen as a function of water flux W, water pressure P and specimen surface temperature θ_s. In this report, the author described numerizing of the equation : h=f (W, P, θ_s). The specially fixed water flux W_d (W1 to W4), water pressure P_d (P1 to P4), specimen surface temperature θ_<sd> (50, 75, to 900℃), and the most probable values of heat transfer coefficient h_<sa> obtained from these experiments were introduced for numerizing of the above-mentioned equation. The principal contents are as follows : (1) In each θ_<sd>, the exponents n1 to n4 of the equation : h_<sa>=AW_d^n corresponding to P_d:P1 to P4 respectively were obtained (A is constant). The mean exponent n^^- is (n1+…+n4)/4. (2) In each θ_<sd>, the exponents m1 to m4 of the equation : h_<sa>=BP_d^m corresponding to W_d:W1 to W4 respectively were obtained (B is constant). The mean exponent m^^- is (m1+…+m4)/4. (3) By using n^^- and m^^-, the equation : h=C(W^<n^^->P^<m^^->) among arbitrary W, arbitrary P and h was numerized in every θ_<sd> (C is constant). (4) h_i and h_<i+1> corresponding to θ_<sd>:θ_<sdi> and θ_<sdi+1> respectively were calculated by using the equation : h=C(W^<n^^->P^<m^^->). Next, by using the relations : [h_i vs. θ_<sdi>] and [h_<i+1> vs. θ_<sdi+1>], the equation : h_x=f(θ_<sx>) to obtain h_x corresponding to an arbitrary θ_<sx> between θ_<sdi> and θ_<sdi+1>, was numerized.
- 2005-09-01