Correlation of exhaust-valve temperatures with engine operating conditions and valve design Page: 4 of 26
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NACA ARR No. E5I20 3
Ta cooling-air temperature
Tg mean effective gas temperature
Tw wall temperature
ql coefficient of heat transfer from gas to wall
rf thermal resistance of fins
ro over-all thermal resistance from point on inside of cylinder
to cooling air
rw thermal resistance of cylinder wall
When a heat balance is set up for a point on the inside surface
of the wall, the heat transferred to the wall H is
H = ql A (Tg - T) (1)
where A is the area considered. Heat transferred away from the
wall .H is
H = - A (Tw - Ta)
= Ko A (Tw - Ta)
where Ko is the over-all conductivity from a point on the inside
of the wall to thu cooling air.
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Zipkin, M. A. & Sanders, J. C. Correlation of exhaust-valve temperatures with engine operating conditions and valve design, report, October 1945; (digital.library.unt.edu/ark:/67531/metadc279466/m1/4/: accessed February 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.