Accession Number : ADA108095


Title :   Convective Heat Transfer for Ship Propulsion.


Descriptive Note : Annual summary rept. no. 6, 15 Jan 80-30 Mar 81,


Corporate Author : ARIZONA UNIV TUCSON ENGINEERING EXPERIMENT STATION


Personal Author(s) : Habib,M A ; McEligot,D M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a108095.pdf


Report Date : 01 Apr 1981


Pagination or Media Count : 109


Abstract : A common geometry recurring in compact Naval propulsion plants is a change in duct size in the primary fluid loop. As a consequence of the upstream plumbing, the fluid is often swirling about the axis in the piping. Heat losses from the primary fluid and thermal stresses in the component depend on the convective heat transfer from the fluid to the component as it undergoes this geometrical transition. The idealized problem is a study of heat transfer in a sudden expansion with swirl flow, the subject of the present report. The same situation also occurs at the entrance to some heat exchanger tubes. Calculations of the flow and heat transfer of a swirling turbulent flow after a sudden pipe expansion are reported. The calculations were obtained by the numerical solution of the time-averaged forms of the continuity, momentum and thermal energy equations together with equations for the turbulence kinetic energy and its rate of dissipation. For a sudden expansion without swirl, the predictions produced satisfactory agreement with available data for the Nusselt number. In the swirling case, there were no heat transfer measurements available for comparison. However, existing measurements of a swirl flow at an expansion without heat transfer were used to test the validity of the flow field calculations. (Author)


Descriptors :   *SHIPS , *TURBULENT FLOW , *PROPULSION SYSTEMS , *CONVECTION(HEAT TRANSFER) , MEASUREMENT , TEMPERATURE , SIZES(DIMENSIONS) , PIPES , CURVATURE , FLOW FIELDS , FLOW RATE , SHEAR STRESSES , DUCTS , KINETIC ENERGY , PARTIAL DIFFERENTIAL EQUATIONS , EXPANSION , THERMAL STRESSES , HEAT LOSS , PRANDTL NUMBER , STEAM POWER PLANTS


Subject Categories : Marine Engineering
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE