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Sunday, July 19, 2020 | History

3 edition of Modeling of transient heat pipe operation found in the catalog.

Modeling of transient heat pipe operation

Modeling of transient heat pipe operation

period covered August 13, 1986 through February 18, 1987

  • 166 Want to read
  • 6 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Heat pipes.,
  • Heat -- Transmission.

  • Edition Notes

    StatementGene T. Colwell.
    SeriesNASA contractor report -- NASA CR-180280.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15391731M

    A Procedures Manual was created for the double-pipe heat exchanger. The theories of transient heat transfer in double-pipe heat exchangers were explained and followed by literature correlations. All of the instrument specifications were defined. A procedure for use of Cited by: 2. Heat is defined in physics as the transfer of thermal energy across a well-defined boundary around a thermodynamic thermodynamic free energy is the amount of work that a thermodynamic system can perform. Enthalpy is a thermodynamic potential, designated by the letter "H", that is the sum of the internal energy of the system (U) plus the product of pressure (P) and volume (V).

    The heat transfer modeling: The energy equation of the scraped surface channel will be solved to predict the temperature distribution in 2-D transient state as follow: (6) where, α is the thermal diffusivity, T is temperature, t is time, r is radial direction and z is the axial flow direction. According to the heat transfer control equation of non-isothermal pipe flow and porous media, combined with the influence of permeable groundwater and tube group, a heat-transfer coupled heat transfer model of the buried pipe group was established, and the accuracy of the model was verified by the sandbox test and on-site thermal response test.

    Ceramic heat pipe wick [microform]: patent application; Heat transfer in pipes [microform] / Th. Burbach; Heat pipe theory and practice: a sourcebook / S. W. Chi; Heat pipes / P. Dunn and D. A. Reay; Modeling of transient heat pipe operation [microform]: period covered Aug through February.   Congedo et al. () investigated the performance of straight pipe, slinky and helical geometries using the CFD code Fluent. The simulations covered one year of GHE operation. The results indicated that the helical GHE arrangement had the highest performance (i.e. 10 times higher heat transfer when compared to straight pipe).


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Modeling of transient heat pipe operation Download PDF EPUB FB2

Get this from a library. Modeling of transient heat pipe operation. [Gene T Colwell; James Modeling of transient heat pipe operation book Hartley; Georgia Institute of Technology. School of Mechanical Engineering.; United States. National Aeronautics and Space Administration.].

Get this from a library. Modeling of transient heat pipe operation: semiannual status report. [Gene T Colwell; James G Hartley; United States.

National Aeronautics and Space Administration.]. Heat Pipe Theory and Modeling. molybdenum-lithium heat pipe has been fabricated and tested in transient and steady state operation at temperatures to K. Maximum power throughput during Author: Bahman Zohuri.

A lumped parameter transient model of a heat pipe is developed and evaluated experimentally during the start up mode of operation by applying a step heat pulse to the evaporator. The data obtained Author: Pascal Brocheny. A numerical simulation of the transient heat pipe performance including the vapor region, wick structure and the heat pipe wall is given.

Furthermore, experimental and numerical analyses of several operating parameters of a low-temperature copper-water heat pipe under uniform circumferential heating and block heating has been performed.

@article{osti_, title = {Multi-Physics Simulations of Heat Pipe Micro Reactor}, author = {Hu, G. and Hu, R. and Kelly, J. and Ortensi, J.}, abstractNote = {System Analysis Module (SAM) is under development at Argonne National Laboratory as a modern system-level modeling and simulation tool for advanced non-light water reactor safety analyses.

Modeling of transient heat pipe operation [microform] / by Gene T. Colwell and James G. Hartley ; submitted to National Aeronautics and Space Administration, Langley Research Center National Aeronautics and Space Administration ; National Technical Information Service, distributor [Washington, D.C.: [Springfield, Va.

A heat pipe is a heat-transfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces. [citation needed]At the hot interface of a heat pipe a liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface.

The vapor then travels along the heat pipe to the. The Heat Transfer Module contains features for modeling conjugate heat transfer and nonisothermal flow effects. These capabilities can be used to model heat exchangers, electronics cooling, and energy savings, to name a few examples.

Both laminar and turbulent flow are supported and can be modeled with natural and forced convection. It is. Select the Pipe Type from one of many Pipe Schedules and the pipe data fields are automatically populated. This is a great time-saving feature.

Users can create their own Pipe Schedules or select from hundreds available. More Device Libraries – Users can create customized libraries which contain data for devices such as pumps, valves, air vacuum valves, surge tanks, back flow preventers. This chapter presents dynamic modeling approaches suitable for organic Rankine cycle (ORC) power plants.

Dynamic models are necessary for the better understanding of the plants’ behavior during transient operation, such as start-up, shutdown, and during rapid load changes.

The estimation of plant operating parameters during transient operation is crucial for monitoring and control of the Author: Mohsen Assadi, Yaser Mollaei Barzi. The Heat Pipe Transient Analysis Model "HPTAM" (Figure 28) was developed at UNM-ISNPS for simulating the transient and steady-state operation, as well as the startup from a frozen state of alkali-metal and low-temperature heat pipes [].

•A variety of high-intensity heat transfer processes are involved with combustion and chemical reaction in the gasifier unit itself. •The gas goes through various cleanup and pipe-delivery processes to get to our heat transfer processes involved in these stages are generally less intense.

In this paper, we present a transient mathematical model for a V-shaped microgrooved heat pipe considering the temporal variations in the fluid flow, and heat and mass transfer, and utilizing a macroscopic by: This technology enables reusing the heat extracted during cooling of the strip in the heating part of the process.

This is achieved by thermally linking the cooling strip to the heating strip via multiple rotating heat pipes. In this context, the dynamic simulation of a full heat pipe assisted annealing line is : Metin Celik, Mrunal Patki, Geert Paulussen, Wiebren de Jong, Bendiks Jan Boersma.

Opposite to steady state model, the transient model is built with consideration of the parameters variation with time, and the model is solved by finite difference method.

Solving procedures of steady-state and transient models are presented in detail. Finally, this work simulated the steady-state and transient operation of a condensate gas Author: Li Changjun, Jia Wenlong, Wu Xia. The compressible Gas Pipe (CGP) uses an algorithm that solves a vector system using the Two-Step Lax-Wendroff method with Boris & Book anti-diffusion.

∂U/∂t + ∂D/∂x = G The CGP unit operation primarily designed for transient calculations with streams calculations with streams. Pipe Gas analyzes steady, one-dimensional, isothermal flow for ideal and non-ideal variable density gases. The module includes the ability to account for ideal natural gas distribution and landfill gas collection.

It is also useful for determining the effects of demand or load changes. However, the focus of this study is on experimental investigations of the transient operation of water heat pipes with emphasis on obtaining data to verify an existing transient heat pipe model [4].

Although the results of several experiments of water heat pipes have been published, the measurements of the axial distribution of the vapor Cited by:   Publications By Topic: Heat Pipe And Thermosyphons Showing 70 results. M.S. and J. Tournier, "Numerical Modeling of High Temperature Heat Pipe Transients, Including Startup from a Frozen State".

ISNPS Report"Experimental Investigation of Transient Operation of a Water Heat Pipe". Proc. 10th Symposium on Space Nuclear. Heat exchangers are an enabling technology for efficient power generation with a closed, recuperated Brayton cycle using supercritical carbon dioxide (sCO 2) as the working exchangers influence the overall system efficiency and system size.

The heat exchanger designs must balance between heat exchanger effectiveness and pressure drop to achieve the desired tradeoff between system.transport limits, as well as steady-state and transient heat pipe behavior.

Silverstein also presents several illustrative design examples. G. P. Peterson () at Texas A&M wrote a general heat pipe textbook: An Introduction to Heat Pipes: Modeling, Testing, and Applications.

Peterson's book includes sections on basic phenomena in heat pipes and. For the heat pipe designs, which have found the widest application, versus the classical capillary-wick heat pipes and the wickless heat pipes or closed two-phase thermosyphons, mathematical schemes are given to calculate the performance and performance limits in Chap.

2. Here in this chapter we will discuss the design criteria and steps for a Author: Bahman Zohuri.