2 edition of study of heat transfer and flow stability with a supercritical water natural-circulation loop. found in the catalog.
study of heat transfer and flow stability with a supercritical water natural-circulation loop.
Written in English
|Statement||Work performed at the Argonne national laboratory.|
|Series||Politecnico di Torino. PT, IN, 46|
|LC Classifications||T4 .T88 no. 46, TJ268 .T88 no. 46|
|The Physical Object|
|Pagination||vii, 90 p.|
|Number of Pages||90|
|LC Control Number||70867822|
Billingsley et al. ()studied the thermal stability and heat transfer characteristics of RP Effects of wall temperature, bulk temperature, and flow rate on heat transfer were investigated in his studies. Paloka et al. () studied the flow of a heat-conducting incompressible Newtonian fluid through a helical pipe with by: 1. In the present study, optimum operating conditions based on the maximum heat transfer rate in NCLs have been obtained for subcritical as well as supercritical fluids. In recent years, there is a growing interest in the use of carbon dioxide (CO 2) as loop fluid in NCLs for a variety of heat transfer applications due to its excellent Cited by: 3.
Experimental study of the coupled thermo-hydraulic-neutronic stability of a natural circulation HPLWR. HEAT-TRANSFER, FLOW INSTABILITIES, SUPERCRITICAL WATER Cited by: EVALUATION OF HEAT TRANSFER AND THERMAL STABILITY OF SUPERCRITICAL JP-7 FUEL Diane L. Linne and Michael L. Meyer National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio Tim Edwards Wright Laboratory Wright Patterson Air Force Base, Ohio David A. Eitman Science Applications International Corp. Fountain Valley File Size: 1MB.
E ect of Supercritical Friction Factor and Heat Transfer Model on the Stability of a Natural Circulation Driven Super Critical Water Reactor M.A. van Iersel Bachelor of Science Thesis Delft University of Technology Faculty of Applied Sciences Dept. of Radiation Science and Technology Sect. Nuclear Energy and Radiation Applications. Review of Heat Transfer Behavior in Supercritical Water Cooled Reactor S.K. Dubey, India S.K. Dubey, India TM12 Effects of body force and variable properties on the performance of turbulence models S. He, UK TM13 Experimental Studies on Critical Flow and Heat Transfer of Water for Near-critical and Supercritical pressures Y. Chen, China.
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Chen et al. () numerically studied the effect of heat transfer on stability and transitions of supercritical CO 2 in a rectangular natural circulation loop using a two-dimensional model. They identified a second “pseudo-critical temperature”, around K for supercritical CO by: The flow and heat transfer characteristics of supercritical CO 2 are studied in a natural circulation loop, a typical design often adopted in energy conversion systems, such as solar heaters, nuclear power plants, geothermal systems, by: The shell and tube heat exchanger consists of horizontal parallel small tubes (Φ × mm) with a length of m.
The supercritical CO 2 flows inside the small tubes and outside the small tubes are coolant water. An equally distributed of K = for heat exchanger part was adopted for all numerical inlet K factor K in was kept to be 0 for both experiments and Author: Lei Zhang, Vijay Chatoorgoon, Robert Derksen.
A 2D axi-symmetric CFD code (NAFA-LOOP) has been developed for studying the heat transfer and steady state characteristics of supercritical CO2 natural circulation loop (SPNCL).
NAFA-Loop is. A 3-D numerical study of turbulent flow of supercritical water flowing upward in two heated parallel channels with constant applied wall heat flux for the Xiong et al.
cases was developed using a RANS model in the Computational Fluid Dynamics (CFD) code ANSYS CFX by Li et : D.S. Ghadge, V. Chatoorgoon, S.J. Ormiston. Steady-State Behavior of Natural Circulation Loops Operating With Supercritical Fluids for Open and Closed Loop Boundary Conditions.
Heat Transfer Engineering: Vol. 33, Selected Papers from the 20th National & 9th ISHMT-ASME Heat and Mass Transfer Conference, January, Mumbai, India, pp.
Cited by: A supercritical water heat transfer facility has been built at the University of Wisconsin to study heat transfer in a circular and square annular flow channel. Operating conditions included mass velocities of – kg/m 2 s, heat fluxes up to MW/m 2, and bulk inlet temperatures up to °C; all at a pressure of 25 by: Study on a supercritical CO 2 solar water heater system induced by the natural circulation Xing-Wei Zhang1, Xiao-Dong Niu1,2, Hiroshi Yamaguchi2 and Yuhiro Iwamoto2 Abstract This article proposes a solar water heater system induced by natural convective flow using supercritical CO 2.
Key-Words: Natural circulation, Reverse flow, Stability analysis, Steam generator, Two-pass boiler 1 Introduction Natural circulation steam generators have many advantages compared to forced- and once-through circulation boilers. The main advantage of the natural circulation system is the simple design which results in an unproblematic Size: 1MB.
Flow-induced heat transfer deterioration can be delayed by increasing system pressure or lowering sink temperature. Bulk temperature level with water is higher than supercritical carbon dioxide.
A computer code SUCLIN using supercritical water properties has been developed to carry out the steady state and linear stability analysis of a SCW natural circulation loop. An experiment of natural circulation of supercritical water in parallel channels was performed in bare tubes of inner diameter mm and heated length m, covering the ranges of pressure of – MPa, mass flux of – kg / m 2 s , and heat flux of up to MW / m 2 .Author: Yuzhou Chen, Chunsheng Yang, Minfu Zhao, Keming Bi, Kaiwen Du.
Natural circulation is an important passive heat-removal mechanism in both existing and next-generation light water reactors. Thermal and stability analyses are performed for a two-phase natural circulation loop.
The homogeneous equilibrium model is employed to describe the two-phase flow in the by: Chen L, Zhang XR, Yamaguchi H, Liu ZSS () Effect of heat transfer on the instabilities and transitions of supercritical CO 2 flow in a natural circulation loop. Int J Heat Mass Transf – Google ScholarAuthor: Lin Chen, Xin-Rong Zhang.
In natural circulation loops, the driving force is usually low as it depends on the riser height which is generally of the order of a few meters.
The heat transport capability of natural circulation loops (NCLs) is directly proportional to the flow rate it can by: In the present study, experimental investigations have been carried out to capture the transient behaviour of a CO 2 based NCL operating under subcritical as well as supercritical conditions.
Water is used as the external fluid in cold and hot heat by: Natural circulation loops encompass a broad range of applications and phenomena. Basic experimental and theoretical studies as well as overall performance and systems testing and analyses have been carried out on natural circulation loops.
Buoyancy-Driven Heat Transfer and Flow Between a Wetted Heat Source and an Isothermal Cube. Heat Cited by: A high-temperature natural circulation loop (NCL) using supercritical carbon dioxide as loop fluid is modeled to study the effects of operating variables and relevant design parameters on loop performance.
The steady-state system model duly considers the axial conduction through loop fluid as well as loop wall and heat transfer with by: 2. T.H.J.J. Van der Hagen, M Rohde, C.P. Marcel(): Fluid-to-fluid modeling of supercritical water loops for stability analysis International Journal of Heat and Mass Transfer pp.
- C. T'Joen, A.G. Class, C.P. Marcel, M Rohde, T.H.J.J. Van der Hagen(): Downscaling a supercritical water loop for experimental studies on system. The present study numerically investigates Density wave oscillations (DWOs), a dynamic instability and captures Heat transfer deterioration (HTD) phenomenon for a Supercritical water reactor (SCWR) of the U.
reference design. A Thermal-hydraulic (TH) model is employed to solve the nonlinearly coupled mass, axial momentum and energy conservation equations in a time domain using Cited by: 2. Hz) when the bulk fluid temperature was close to the pseudo-critical temperature in supercritical water natural circulation loop.
Yu et al.  carried out investigation on the steady-state and. Comprehensive work has been performed by theoretical and numerical methods in order to study the steady state, transient and stability characteristics of a double diffusive natural circulation loop.
It was found that the behavior of the flow in the system depends on the initial conditions and on the location of the state in the seven-parameter space of the thermal and saline Rayleigh numbers Cited by: 1. This article proposes a solar water heater system induced by natural convective flow using supercritical CO 2 as a working fluid.
In order to investigate the characteristics of the system, the dynamic characteristics and heat transfer property of the supercritical CO 2 flow are measured under variable ambient conditions. The performance parameters such as the heat recovery efficiency Cited by: 2.