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Distribution Category: R e a c t o r C o r e Systems (uC -79e) ANL -7 7 -7 3 NOTICE ARGONNE NATIONAL LABORATORY I 9700 South C as s Avenue Argonne, Illinois 60439 This report contains information of a preliminary nature and was prepared primarily for internal use at the origjnating installation. It is subject to revision or correction and therefore does not represent a final report. It is passed to the recipient in confidence and should not be abstracted or further disclosed without the approval of the originating installation or USDOE NOTICE ma report was prepared as an account of work sponsored by the Utiited Slates Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors. or their employees, makes any warranty. express or implied, or assumes any legal liability or rtsponsibdity fol the accuracy, cOmpICtCnesS or usefulness of any informat~on. apparatus. product or process disclosed, or reprevnts that its use would not DISCLAIMER

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A comprehensive, multidimensional, thermal-hydraulic model is developed for the analysis of shell-and-tube heat exchangers for liquid metal services. For the shellside fluid, the conservation equations of mass, momentum and energy for continuum fluids are modified using the concept of porosity, surface permeability and distributed resistance to account for the blockage effects due to the presence of heat transfer tubes, flow baffles/shrouds, the support plates, etc. On the tubeside, the heat transfer tubes are connected in parallel between the inlet and outlet plenums, and tubeside flow distribution is calculated based on the plenum-to-plenum pressure difference being equal for all tubes. It is assumed that the fluid remains single-phased on the shell side and may undergo phase-change on the tube side, thereby simulating the conditions of Liquid Metal Fast Breeder Reactor (LMFBR) intermediate heat exchangers (IHX) and steam generators (SG). The analytical model predictions are compared with three sets of test data (one for IHX and two for SG) and favorable results are obtained, thus providing a limited validation of the model.

In• most flows of liquids and their vapors, the phases are dispersed randomly. :Ln both space and time. These dispersed flows can be described only statistically or i~ terms of averages. Local volume-time averaging is ~sed here to deriv~ a selfconsistent set of e•quations governing momentum and energy transfer in disp_ersed, turbulent, multiphase flows. The empiricisms • required for use with these equations are the subject of current re~earc~.