New observations of burnout during the upflow and downflow of isopropanol and methanol over horizontal cylinders are added to previous observations. A criterion is developed to determine whether or not gravity influences burnout in any such flow. A prediction that depends on one empirical constant is then developed to predict burnout when gravity is not influential. Those of the existing data that are uninfluenced by gravity are represented within ± 20 percent by the prediction. It is also shown that a low-speed downflow can cause the hydrodynamic burnout to be replaced with a very inefficient buoyancy burnout mechanism.

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