... Abstract Dryout and post-dryout heat transfer experiments in a tight three-rod bundle with spacer grids are carried out at Shanghai Jiao Tong University. The test section is made up of three heated rods with an outer diameter of 15 mm and three unheated components. The pitch-to-diameter ratio...

... capacity, which makes the heat transfer phenomenon near the critical point more complicated, even deteriorating. On the other hand, the curved geometry of the spiral pipe leads to a special secondary flow phenomenon in the fluid, which will intensify the heat and mass transfer and improve the heat transfer...

... and drastic properties variation. The results showed that in the local position of a pitch, temperature and velocity on cross-section presented strong nonuniformity due to the disturbance of corner and symmetry on the side of corner, which showed heat transfer enhancement or weakness on different locations...

... cover gas heat transfer numerical simulation Proceedings of the 2022 29th International Conference on Nuclear Engineering ICONE29 August 8-12, 2022, Virtual, Online ICONE29-92323 Study on the radiation heat transfer effect of the covered gas space of the pool reactor Xinyue LUO North China Electric...

... heat transfer capacity. In order to accurately simulate the turbulent heat transfer of liquid metals in narrow rectangular channels, based on the relevant experimental data, this paper explored suitable numerical simulation methods. First of all, according to the research object, the appropriate...

... considered. For some cases, conjugated heat transfer including pipe walls was modeled. Various sensitivity studies such as mesh sizes, meshing approaches, considered computational domains, initial, inlet, and outlet conditions, and axial conduction in pipe walls were performed. The meshing approach was based...

... Abstract Heat pipe cooled reactors have a promising future in the next generation of reactor design. The heat pipe, which is the core device for heat transfer from the core to the outside, determines the safety of the heat pipe reactor and the efficiency of power generation. In the high...

... is model with a vertical annulus. Furthermore, the sensitivity study on the node number is conducted and 99 nodes for each pipe and annulus are fine enough. Thirdly, the simulated result shows the 1D code can used to predict the steady-state heat transfer rate of the H-OTSG under various thermal power...

... Abstract The heat flux of the tube bundle on the shell side of the steam generator is non-uniform and the experimental research in this field is mainly carried out in the aspect of uniform heating. So it is necessary to investigate its influence on heat transfer conditions. In this paper...

... Abstract Heat transfer characteristics of two-layer corium pools under rolling conditions were studied experimentally and numerically in this paper. In the experiments, the test section was designed as a semi-ellipsoidal slice, measuring a span of 1.2m, a total pool depth of 0.32m...

... Abstract The peculiar heat transfer mechanism of supercritical fluids has been studied for a long time, especially the flow and heat transfer in the tubes. Numerous experiments have demonstrated the three heat transfer modes of supercritical fluids: normal heat transfer, improved heat transfer...

... historical review for narrow rectangular thermal-hydraulic characteristics under marine conditions is proposed, including an expansive number of experimental and numerical studies in open literatures for recent decade. The pressure drop and heat transfer characteristics are chiefly clarified in this paper...

... Abstract As one of the cooling methods for the blanket in a fusion reactor, forced convection using helium gas has been considered as one of the promising candidates. In this study, in order to clarify the effect of tube length on heat transfer for forced flow of helium gas under various...

... compares the strength of these two effects in the expansion of a single bubble, and theoretically explains the driving force of the pressure increase in the simulation experiment and the potential flow pattern. coolant-coolant interaction inner pressure bubble expansion velocity heat transfer...

...Abstract Abstract In the present paper, the capabilities of a similarity theory for heat transfer to supercritical pressure fluids are further investigated with respect to past work, widening the range of the addressed operating conditions. In particular, experimental data for water at 25 MPa...

... on Nuclear Engineering ICONE28 August 4-6, 2021, Virtual, Online ICONE28-64822 EXTENDING A FLUID-TO-FLUID SIMILARITY RATIONALE FOR HEAT TRANSFER AT SUPERCRITICAL PRESSURE TO R134a Sara Kassem 1, Andrea Puciarelli, Walter Ambrosini, Dipartimento di Ingegneria Civile e Industriale, Università di Pisa Pisa...

... Proceedings of the 2021 28th International Conference on Nuclear Engineering ICONE28 August 4-6, 2021, Virtual, Online ICONE28-62115 EXPERIMENTAL STUDY ON HEAT TRANSFER CHARACTERISTICS OF WATER INJECTION ON MOLTEN POOL WITH LOW MASS FRACTION OF ZIRCONIUM Zongyang LI1, Huajian CHANG1,2, Fangfang...

...Abstract Abstract Thermal efficiency and safety of Generation-IV nuclear-power-reactor concept - Supercritical Water-cooled Reactor (SCWR) depend on solid knowledge of specifics of SCW thermophysical properties and heat transfer within these conditions. As a preliminary, but conservative...

... (prototypical) NC facility. Keywords: Natural circulation, Heated Channel, Temperature variation, Pressure Drops, Flow Rate, Heat Transfer, Thermocouples, Single Phase, Steady State INTRODUCTION Single-phase natural circulation is the mode of coolant circulation in the current pressurized water and heavy water...

...Abstract Abstract Heat transfer between cladding and coolant during transient scenarios remains a critical area of uncertainty in understanding nuclear reactor safety. To advance the understanding of transient and accident scenarios involving critical heat flux (CHF), an in-pile experiment...