Magnitude Of Air Flow Research Articles

Heat Transfer of Particles in the Domain where Forced and Natural Convections Co-Exist

When a small particle or a fine wire is heated in low speed air stream, the effect of natural convection on the heat loss is important. A typical example is the use of a thermistor or a hot-wire anemometer for measuring air velocities. In this case, the effect of the direction and the magnitude of air flow together with natural convection effect must be taken into consideration. The present paper reports the results of measurements of heat transfer coefficients by forced convection at very low air velocities (0.01∼0.5m/s) in varied flow directions. As previously reported, the specimens were small bead-type thermistors, specially prepared for this experiment. The experimental procedures have been remarkably simplified by the use of thermistors. The results have been expressed by experimental formulas in the same form as in the previous paper.