In the research reported in this Bulletin, asphalt was heated, on a
semi-commercial scale, by means of condensing diphenyl vapor. The
asphalt was pumped through the inside of the heating tube, and
condensing diphenyl surrounded the tube. It was found that this
method of heating was entirely practical from a mechanical and
control point of view, that the quality of the asphalt was not
impaired to the slightest degree even under extreme heating
conditions, and that overall heat transfer coefficients of 31 to 44
B.t.u. per hr. per sq. ft. per DegreesF. can easily be obtained.
The observed film coefficients of heat transfer on the asphalt and
diphenyl sides of the heating surface were found to be reasonably
consistent with existing heat transfer theories for analogous
cases.
General
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