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Hptam, a Two-Dimensional Heat Pipe Transient Analysis Model, Including the Startup from a Frozen State
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Hptam, a two-dimensional heat pipe transient analysis model, is used to analyze the startup of a radiatively-cooled sodium heat pipe from a frozen state. Calculated wall temperatures at different times during the startup transient are in good agreement with measurements.
A two-dimensional, heat pipe transient analysis model, 'hptam', is developed for simulating operations of fully-thawed heat pipes.
A two-dimensional analytical model for low-temperature cylindrical heat pipes was elaborated by zhu and vafai [20].
Two dimensional numerical modeling of a flat heat pipe a thesis submitted to the graduate school of engineering and science of izmir institute of technology.
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Oct 13, 2020 pdf space application of heat pipes in power systems, radiators and ''hptam'' a two‐dimensional model, is developed for simulating.
Hptam, a two‐dimensional heat pipe transient analysis model, is developed to model the operation of heat pipes in space environment. This paper describes the approach used in hptam for modeling heat and mass transfers in the wick of a heat pipe during the startup from a frozen state.
Heat pipes are highly reliable and efficient energy transport devices, which are being considered for many terrestrial and space power thermal-management applications, such as high-performance aeronautics and space nuclear and solar dynamic power.
‘‘hptam,’’ a two‐dimensional model, is developed for simulating transient performance of fully thawed liquid‐metal and non liquid‐metal heat pipes.
Second, compared to a one-dimensional tubular heat pipe, the width of a two-dimensional heat pipe allows an adequate cross section for heat flow even with a very thin device. These thin planar heat pipes are finding their way into “height sensitive” applications, such as notebook computers and surface mount circuit board cores.
Abstract: a computational model is developed for the analysis of the transient operation of a flat heat pipe. The analysis involves the solution of the two-dimensional continuity, momentum and energy equations coupled with the state equation in the vapor core, the transport equations for a porous medium in the wick, and the two-dimensional heat conduction equation in the heat pipe wall.
4 2d heat structure and 3d porous medium flow coupling figure 12, heat structure temperature distribution in a heat pipe from sam simulation.
This two-dimensional, axisymmetric formulation accounts for the thin liquid condensate film on the inner surface of the rotating pipe wall, the vapor flow in the vapor space, and the unsteady heat conduction in the pipe wall.
A two dimensional schematic of a forced convection heat transfer channel ow con guration schematic is an idealization of a mid-plane in z-direction (perpendicular to the plane of the paper or computer screen). Hence the gure could represent a parallel (top and bottom) plate con ned channel ow or a parallelepiped pipe.
Low‐re turbulence models are used in the computation of convective heat transfer in two‐dimensional ribbed passages. The cases computed include ribbed annular channels, pipes and plane channels. The models investigated cover both zonal models, that obtain the near‐wall dissipation rate from the wall distance, and full low‐re models.
Standard heat pipes only transfer heat along the axis of the heat pipe, so they are best suited to cooling discrete heat sources. Vapor chambers or high conductivity (hik™ ) plates are used to collect heat from larger area sources, and either spread the heat, or conduct it to a cold rail for cooling.
4, and tita- nium is used for pipe and working fluid is water.
A complete mathematical model for transient two-dimensional heat pipes is presented. The numerical results for both simulated compressible vapor flow with high mach numbers and the vapor flow of a high-temperature heat pipe are compared with the experimental data in the literature.
Heat pipe transient analysis model hptam is developed for simulating the operation of fully-thawed liquid metal and non liquid-metal heat pipes. This model has the capability of predicting the radius of curvature of the liquid meniscus at the liquid-vapor interface and pooling effects in the heat pipe.
Tien, “steady-state heat and mass transfer in the vapor-gas region of a heat pipe filled with noncondensible gas (two-dimensional approximation),” trans.
Flow of fluid in a heated pipe is simulated with the help of ansys fluent. The wall temperature of the pipe is maintained at constant temperature(dirichlet.
A two-dimensional, transient mathematical model that accounts for diffusion and variable properties on the operation of a heat pipe is presented. The major advantage over previous models is that this model treats the noncondensable gas as a separate entity, which is described by mass transport phenomena.
A two-dimensional, heat pipe transient analysis model, ‘hptam’, is developed for simulating operations of fully-thawed heat pipes. The model is benchmarked using transient experimental data of a horizontal water heat pipe.
This report describes the user's manual for 'hptam,' a two-dimensional heat pipe transient analysis model. Hptam is described in detail in the unm-isnps-3-1995 report which accompanies the present manual. The model offers a menu that lists a number of working fluids and wall and wick materials from which the user can choose. Hptam is capable of simulating the startup of heat pipes from either.
A two-dimensional heat pipe transient analysis model, 'hptam,' was developed to simulate the transient operation of fully-thawed heat pipes and the startup of heat pipes from a frozen state.
Copper/water heat pipes are commonly used in many military and consumer electronics, including almost all laptops, typically in heat pipe assemblies. The benefits of copper/water heat pipes include their ability to operate at temperatures up to about 150°c, operate against adverse elevations of up to 25cm, and tight bend radius.
The wick consists of therefore, evaporative flow in a cross-sectional plane can be treated as two- dimensional.
‘‘hptam,’’ a two‐dimensional model,is developed for simulating transient performance of fully thawed liquid‐metal and non liquid‐metal heat pipes.
Simulate a transient two-dimensional model of high temperature heat pipes from frozen state, and allows the presence of noncondensable gas within vapor. And [tournier and el-genk, 1996] presented the code hptam to simulate a transient two-dimensional model of heat pipes from frozen state with the presence of noncondensable gas within.
A nonsteady-state two-dimensional model and analysis of nonisothermal state of heat pipe surfaces under nonuniform heat exchange along the perimeter and length.
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