Custom Integrated Circuits

Contains reports on twelve research projects.Analog Devices, Inc.International Business Machines, Inc.Joint Services Electronics Program (Contract DAAL03-86-K-0002)Joint Services Electronics Program (Contract DAAL03-89-C-0001)U.S. Air Force - Office of Scientific Research (Grant AFOSR 86-0164)Rockwell International CorporationOKI Semiconductor, Inc.U.S. Navy - Office of Naval Research (Contract N00014-81-K-0742)Charles Stark Draper LaboratoryNational Science Foundation (Grant MIP 84-07285)National Science Foundation (Grant MIP 87-14969)Battelle LaboratoriesNational Science Foundation (Grant MIP 88-14612)DuPont CorporationDefense Advanced Research Projects Agency/U.S. Navy - Office of Naval Research (Contract N00014-87-K-0825)American Telephone and TelegraphDigital Equipment CorporationNational Science Foundation (Grant MIP-88-58764

Custom Integrated Circuits

Contains reports on nine research projects.Analog Devices, Inc.International Business Machines CorporationJoint Services Electronics Program Contract DAAL03-89-C-0001U.S. Air Force - Office of Scientific Research Contract AFOSR 86-0164BDuPont CorporationNational Science Foundation Grant MIP 88-14612U.S. Navy - Office of Naval Research Contract N00014-87-K-0825American Telephone and TelegraphDigital Equipment CorporationNational Science Foundation Grant MIP 88-5876

Custom Integrated Circuits

Contains reports on ten research projects.Analog Devices, Inc.IBM CorporationNational Science Foundation/Defense Advanced Research Projects Agency Grant MIP 88-14612Analog Devices Career Development Assistant ProfessorshipU.S. Navy - Office of Naval Research Contract N0014-87-K-0825AT&TDigital Equipment CorporationNational Science Foundation Grant MIP 88-5876

Recommendations for new Experiments able to better Characterize Flashing Flows in nozzles for improving Critical Flow Modelling in System Codes

The FONESYS network of system code developers made a benchmark of eight system codes against Two-Phase Critical Flow (TPCF) experiments, which updated the state of the art in TPCF modelling. 0-D and 1-D TPCF code models still have large prediction errors particularly for slightly sub-cooled inlet conditions. Three main reasons explain these errors: (1) 3D effects in complex geometry, (2) nucleation delay, which depends on non-well-controlled parameters such as purity of water or status of metallic surface, (3) interfacial transfers in rapidly changing non-established flashing flow with unknown flow regimes. It seems possible to progress at least on the third point using new measurements techniques. The SILENCE network of experimentalists in thermal-hydraulics conducted reflections on the type of measurements that should be used in future experiments on TPCF to provide new local information on flow regime, bubble size, film thickness and drop size. This paper first recalls the characteristics of TPCF and summarizes the conclusions of the benchmark of TPCF code models. Then, one presents the limitations of the current modelling, and the limitations of the existing TPCF database. The needs of new measurements are listed. Advanced measurement techniques are reviewed with an evaluation of their applicability to flashing flow in nozzles. Then, recommendations for any new experiment on TPCF are given