Heat transfer during condensation inside a horizontal tube
Rosson, Harold F.
Doctor of Philosophy
Heat transfer data were taken for methanol and Freon-12 condensing inside a horizontal tube over considerable ranges of pressure, temperature driving force, liquid loading, and vapor velocity. A single mechanism for heat transfer could not explain the behavior of this and other data over the entire range of the variables. For condensation in a horizontal tube, three primary regions of flow are postulated: (1) semi-stratified flow (annular condensation and run-down superimposed on stratified flow), (2) laminar annular flow, and (3) turbulent annular flow. A semi-theoretical equation, NuPr-1/3=0.388 M1/6DGvm r/rv 1/21/4 is developed and shown to be applicable to both semi-stratified and laminar annular flow. Other equations must be used for turbulent annular flow.