exponent, if it can be confirmed, differs from the finding of Sieder and Tate (8) that the value of 0.14 for heat transfer inside circular pipes extends throughout the streamline-and turbulentflow regions. As mentioned previously, however, because of the difference in flow patterns involved, there is no reason to expect that the indications of these experiments should necessarily agree with those of Sieder and Tate. In fact, the inclusion of an empirically determined effective mass velocity and

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... the outside diameter of the tubes in the modified Reynolds number used here makes it impossible to compare, on the basis of numerical values of Reynolds numbers, the results of the present work with those of Sieder and Tate. CONCLUSION The correlation method of Short (1) for heat-transfer coefficients on the shell side of a half-moon baffled shell-and-tube heat exchanger adequately represents the data taken in this study, except for the fact that heating and cooling data, when plotted, fall on separate lines. At modified Reynolds numbers below 600 this can be corrected by introducing the function I -I , as