It will be possible to combine the flow structure measurement with an angular resolved heat transfer for a wide parameter range. The water cooling outside of the tube will be realized by forced convection. In parallel the flow structure of a two phase flow inside and along the tube will be detected with the help of x-ray tomography. Therefore the tube will be equipped with detectors, both temperature and pressure, in several directions perpendicular to the tube axis to be able to resolve the angular heat transfer. Within the project the heat transfer capacity of a heat exchanger tube will be investigated. Goal of the program is to optimize the numerical models and therefore the performance of computer codes analyzing passive systems. In order to be able to analyze these kind of systems with the help of state of the art computer codes the implemented numerical more » models for heat transfer, pressure drop or two phase flow structure must be able to predict the system performance in a wide parameter range. Therefore the systems depend on a strong link between heat transfer and pressure drop determining the mass flow through the system. By balancing the pressure drop the system finds its operational mode. Heat transfer to the coolant results in a density difference providing the driving head for the required mass flow. These systems use two phase natural circulation. Many innovative reactor concepts for Generation III nuclear power plants use passive safety equipment for residual heat removal. The evaluation of a previously described two-phase flow vortex decay solution was completed. A number of forced-flow saturation boiling models for the cases of linear and rotational flow are compared with experimental linear flow water data large differences in heat transfer and friction were found depending upon the flow type postulated. The results of coolant heat and momentum transfer analyses for the liquid metal program are summarized. These experiments revealed that one boiler test section pressure tap had a leak in more » the weld. Satisfactory heat balances were obtained and experimental heat transfer conductances for the boiler were found to be in agreement with predicted values. The purpose of these studies was to establish the accuracy of the heat transfer instrumentation for the boiler test section, gain operating experience and obtain information on system integrity. The liquid metal heat transfer system that is shortly to be used to investigate fundamental boiling and condensing phenomena in liquid metals was sufficiently completed so that preliminary non-boiling water heat transfer experiments were conducted. It is shown, in the near perfect filter limit, that the analytical model properly describes the effects obtained in both the balanced pressure and the convection dominated limits. Some experimental data is given which verifies the large effects which the presence of a low permeating specie in the tube bore can have on the flow of another specie which readily permeates the tube walls. The possibility of using secondary control species to favorably alter the flow characteristics of primary species is demonstrated. The resulting effective separation ratio for a tube may be either greater or less more » than that for the tube material in slab form. Tube materials having specie separation ratios varying from unity to very large or very small values are included in the study. Detailed analytical results are generated via exact limiting solutions as well as numerical integration of the governing equations for both positive and negative global velocity cases.
Water cad how to help with high pressure steady state series#
The limits of validity for the modeling assumptions used are established and are given in terms of a series of inequalities involving the key parameters. The transport of gaseous species in dead-end tubes having selectively permeating walls was investigated.