Discussion “Pressure Drop During Refrigerant Condensation Inside Horizontal Smooth, Helical Microfin, and Herringbone Microfin Tubes” (Olivier, J. A., Liebenberg, L., Kedzierski, M. A., and Meyer, J. P., 2004, J. Heat Transfer, 126(5), pp. 687–696)

Abstract

In the paper “Pressure Drop During Refrigerant Condensation Inside Horizontal Smooth, Helical Microfin, and Herringbone Microfin Tubes” (Olivier, J. A., Liebenberg, L., Kedzierski, M. A., and Meyer, J. P., 2004, J. Heat Transfer, 126 (5), pp. 687–696), there are some errors in equations. The errors will be summarized first. After that, a general expression for the liquid-only friction factor fLo will be presented because the general form presented in this paper, Eq. (16), is not valid for helical microfin tubes.