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3 edition of An analytical investigation of transient effects on rewetting of heated thin flat plates found in the catalog.

An analytical investigation of transient effects on rewetting of heated thin flat plates

An analytical investigation of transient effects on rewetting of heated thin flat plates

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

    Subjects:
  • Heat -- Transmission.

  • Edition Notes

    StatementJ.A. Platt.
    SeriesNASA technical memorandum -- 106120., NASA technical memorandum -- 106120.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14697193M

    3 Transient Heat Transfer (Convective Cooling or Heating) All the heat transfer problems we have examined have been steady state, but there are often circumstances in which the transient response to heat transfer is critical. An example is the heating up of gas turbine compressors as they are brought up to speed during take-off.   This work investigates the transient response of the thermal environment in air cooled data centers through experiments, analytical and computational tools. The key thermal characteristics of the various data center components were extracted from a set of experiments. This includes the development of practical experimental procedures for the thermal characterization of servers solely .

    This article investigates the transfer of heat with reactant (oxygen) consumption in a stockpile of reactive material. A reactive material is any carbon or hydrocarbon containing component in a stockpile that readily reacts with the oxygen due to exothermic chemical reaction, where self-ignition may take place if heat generation rate during the combustion process within the stockpile, may.   Two-dimensional Transient heat conduction: • Fig. shows a rectangular region where the heat transfer in x and y directions are significant, and heat transfer in the z direction is negligible. • Divide the rectangular region into a nodal network of thicknesses ∆x and ∆y as shown.

    characteristics of liquid films on heated rods, tubes, and flat plates, no solutions are yet available to describe the rewetting process of a hot plate subjected to a uniform heating. A model is presented to analyze the rewetting process of such plates with and without grooves. Approximate analytical solutions are presented for. Langellotto, O. Manca, S. Nardini, Numerical analysis of transient natural convection in air in convergent vertical channels with uniformly heated plates, Numerical Heat Transfer-Part A, vol. 51, pp. ,


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An analytical investigation of transient effects on rewetting of heated thin flat plates Download PDF EPUB FB2

AN ANALYTICAL INVESTIGATION OF TRANSIENT EFFECTS ON REWETTING OF HEATED THIN FLAT PLATES J.A. Platt National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio ABSTRACT The rewetting of a hot surface is a problem of prime im- portance in the microgravity application of heat pipe tech- nology, where rewetting controls the time before operations can be re-established following depriming of a heat by: 1.

Get this from a library. An analytical investigation of transient effects on rewetting of heated thin flat plates. [J A Platt; United States. National Aeronautics and Space Administration.]. An analytical investigation of transient effects on rewetting of heated thin flat plates.

By J. Platt. Abstract. The rewetting of a hot surface is a problem of prime importance in the microgravity application of heat pipe technology, where rewetting controls the time before operations can be re-established following depriming of a heat pipe Author: J.

Platt. An analytical investigation of transient effects on rewetting of heated thin flat plates Conference Platt, J A The rewetting of a hot surface is a problem of prime importance in the microgravity application of heat pipe technology, where rewetting controls the time before operations can be re-established following depriming of a heat pipe.

Approximate analytical solutions are presented for the prediction of the rewetting velocity and the transient temperature profiles of the plates. It is shown that the present rewetting velocity solution reduces correctly to the existing solution for the rewetting of an initially hot isothermal plate without heating from beneath the by: A high surface roughness promotes rewetting that may be initiated at several places simultaneously.

For an initial plate temperature of °C and a total height roughness of 5 μm, rewetting took place without the occurrence of a vapor film; surfaces at or above °C exhibited vapor film formation, even for a high jet subcooling of 80 °C. An analytical investigation was conducted to examine and predict the capillary dryout and rewetting behaviors occurring at the evaporator section of room-temperature heat pipes during startup.

The physical model is based on the displacement of a leading-edge front of a thin liquid layer flowing on finite groove uniformly heated with a constant heat flux.

A transient rewetting model was developed to describe the effect on the quench-front velocity of the precursory cooling and exothermic reactions downstream of the quench front.

The model was used to calculate, as a function of time, the quenching velocity and the temperature spatial distribution using the surface heat flux as input. change of conditions. Transient heat conduction occurs in cooling of I.C engines, automobile engines, heating and cooling of metal billets, cooling and freezing of food, heat treatment of metals by quenching, starting and stopping of various heat exchange units in power insulation, brick burning, vulcanization of rubber, etc.

There are two. ANALYTICAL HEAT TRANSFER Mihir Sen Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame, IN May 3, Theoretical and experimental investigations of the rewetting characteristics of thin liquid films over heated and unheated capillary grooved plates were performed.

To investigate the effect of gravity on rewetting, the grooved surface was placed in upward and downward-facing positions. way to think about we shall explain the flow of heat in terms more satisfactory to the modern ear; however, it will seldom be wrong to imagine caloric flowing from a hot body to a cold one.

An experimental investigation on rewetting has been carried out by injecting water from the top of a hot vertical heater. of liquid films on heated rods, tubes, and flat plates, no solutions.

5 Notes About Recovery Mechanism and b Value (from Arps)-Single-phase liquid production, high-pressure gas, tubing-restricted gas, poor waterflood performance: b = 0-Solution gas drive: analysis is only valid when recovery mechanism.

Transient Analysis • The difference of analysis of circuits with energy storage elements (inductors or capacitors) & time-varying signals with resistive circuits is that the equations resulting from KVL and KCL are now differential equations rather than algebraic linear equations resulting from the resistive circuits.

Although several investigations have been conducted to determine the rewetting characteristics of liquid films on heated rods, tubes, and flat plates, no solutions are yet available to describe.

Experimental and Analytical Investigation of the Transient Thermal Response of Air Cooled Data Centers the model takes into account the effect of the air volume, the building Conjugate Heat Transfer Model of the CRAH Heat Exchanger.

Appendix-H: CFD as an Alternative to Conduit Approach for Room Thermal. One of the most important sources of renewable energy is solar energy, which is readily available throughout the world.

There is a requirement to make the solar energy affordable for everyday use in order to minimise the present reliance on fossil fuels. This would also assist in meeting the requirements of limiting greenhouse-gas effects, and hence conserve the environment from pollution.

Several previous experimental and analytical inves- tigations have studied the dryout and rewetting characteristics of liquid flowing over smooth hot sur- faces [] and an exact analytical solution for deter- mining the rewetting velocity of thin liquid films on flat heated surfaces has been developed as a function of the mass flux [12], i.e.

Approximate Analytical Methods for Solving Transient Heat Conduction Problems Biot’s variational method to fluidized-bed coating on thin plates. Transactions of the ASME, J. of Heat Transfer p.

Taler J () Defining transient temperature field in a flat wall with a variable heat conduction coefficient. Theoretical and. Transient Dynamic Response of a Thermoelastic Rod, the Features of Which Are Described by the Green-Naghdi Theory of Thermoelasticity Without Energy Dissipation, Under Shock Interaction Transient Dynamic Response of Spatially Curved Thermoelastic Thin-Walled Beam of Open Section.Younsi, R., et al.: Transient Analysis of Heat and Mass Transfer during THERMAL SCIENCE, YearVol.

19, No. 2, pp. 0w (1 ) pp q c ccM c M A + = ++ (16) where M [%] is moisture content, cpw – the heat capacity of water, cp0 – the heat capacity of dry wood, and Ac – the parameter which is a function of moisture content and temperature. Large Eddy Simulations are carried out to analyze flow past flat plate in different configurations and inclinations.

A thin flat plate is considered at three inclination angles (α = 30°, 60° and 90°) and three aspect ratios (AR =2 and 5).

The Reynolds number based on the free stream velocity and chord length of the plate at different inclination angles varies betw to ,