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
θs. In this report, the author described numerizing of the equation:
h=f (
W,
P,
θs). The specially fixed water flux
Wd (W1 to W4), water pressure
Pd (P1 to P4), specimen surface temperature
θsd (50, 75, to 900°C), and the most probable values of heat transfer coefficient
hsa obtained from these experiments were introduced for numerizing of the above-mentioned equation.
The principal contents are as follows: (1) In each
θsd, the exponents n1 to n4 of the equation:
hsa=A
Wnd corresponding to
Pd: P1 to P4 respectively were obtained (A is constant). The mean exponent n is (n1+…+n4)/4. (2)In each
θsd, the exponents m1 to m4 of the equation:
hsa=B
Pmd corresponding to
Wd: 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(
WnPm) among arbitrary
W, arbitrary
P and
h was numerized in every
θsd (C is constant). (4)
hi and
hi+1 corresponding to
θsd:
θsdi and
θsdi+1 respectively were calculated by using the equation:
h=C(
WnPm). Next, by using the relations: [
hi vs.
θsdi] and [
hi+1 vs.
θsdi+1], the equation:
hx=f(
θsx) to obtain
hx corresponding to an arbitrary
θsx between
θsdi and
θsdi+1, was numerized.
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