AN INVESTIGATION OF AIRCRAFT HEATERS ⅩⅩⅦ - DISTRIBUTION OF HEAT-TRANSFER RATE IN THE ENTRANCE SECTION OF A CIRCULAR TUBE

摘要

Experimental data on the variation of the point unit thermal conductance in the entrance section of a circular tube are presented for 16 different flow conditions of the entering air. Results are compared with values calculated from existing analytical solutions.nThe average (integrated mean with length) unit thermal conductance is also calculated for eight entering-air conditions and is compared with values resulting from analytical methods. In many cases the experimental values are appreciably higher than those derived from equations which are based on over-all data taken on long pipes.