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Wednesday, July 22, 2020 | History

1 edition of Parametric investigation of critical heat flux in a vertical forced convective channel found in the catalog.

Parametric investigation of critical heat flux in a vertical forced convective channel

Parametric investigation of critical heat flux in a vertical forced convective channel

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Published by Institute of Nuclear Energy Research in Taiwan, Republic of China .
Written in English

    Subjects:
  • Nuclear reactors -- Cooling.,
  • Nuclear reactors -- Fluid dynamics.,
  • Heat -- Transmission.

  • Edition Notes

    Statementby Shih-Tse Yin ... [et al.].
    SeriesINER ;, 0699, INER (Series) ;, 0699.
    ContributionsYin, Shih-Tse.
    Classifications
    LC ClassificationsTK9212 .P37 1986
    The Physical Object
    Paginationv, 56 p. :
    Number of Pages56
    ID Numbers
    Open LibraryOL2111949M
    LC Control Number88165771

      This book comprises selected papers from the First International Conference on Convective Flow Boiling. The purpose of the conference is to examine state-of-science and recent developments in technology of flow boiling, i.e., boiling systems which are affected by convective :// Pioro, I.L., Cheng, S.C.,Vasic, A. and Antoshko, Yu., Effects of Flow Obstructions on the Critical Heat Flux in a Vertical Circular Tube with Upward Flow of Ra, Report NumberUO-MCG-TH, Prepared for Atomic Energy of Canada Ltd., January , pages

      Katto, Y., Ohno, H.: An improved version of the generalized correlation of critical heat flux for the forced convective boiling in uniformly heated vertical tubes. Int. J. Heat Mass Transf. 27(9), – () CrossRef Google Scholar Computer-aided parametric analysis of mixed convection in ducts Article in International Journal of Heat and Mass Transfer 44(10) May with 5 Reads How we measure 'reads'

    Critical Heat Flux in Forced Convective Subcooled Boiling With Multiple Impinging Jets J. Heat Transfer (February, ) Enhancement of Single-Phase Heat Transfer and Critical Heat Flux From an Ultra-High-Flux Simulated Microelectronic Heat Source to a Rectangular Impinging Jet of Dielectric Liquid   An experimental investigation of the forced convective heat transfer of individual and arrays of multiple two-dimensional obstacles is reported. The airflow rate was varied from channel~vafai/Publications/a/


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Parametric investigation of critical heat flux in a vertical forced convective channel Download PDF EPUB FB2

The Critical Heat Flux (CHF) prediction under high pressure condition, even close to the vicinity of the critical pressure of water, is an important issue. Although there are many empirical CHF correlations, most of them have covered the pressure under 15MPa.

In this study, based on the CHF experiment database of upflow boiling in vertical round tube from 15MPa to the vicinity of the critical Abstract. A superposition model is developed to predict the critical heat flux in forced convection flow. The model is applied to available experimental results in boiling water flows and good agreement is obtained between the model and test data over the multitude of geometries, flow rates, pressures, and fluid enthalpies tested to :// Parametric effects on dryout of propane in a vertical circular mini-channel.

By MH Maqbool, An improved version of the generalized correlation of critical heat flux for forced convective boiling in uniformly heated vertical tubes, Investigation of saturated critical heat flux A basic heat-transfer apparatus was designed and constructed for the study of forced-convection boiling in small channels.

The various regions of forced-convection surface boiling were studied experimentally and analytically. In the region of low wall superheat, the heat flux can be predicted by available correlations for forced ://   @article{osti_, title = {Investigation of non-Darcian forced convection in an asymmetrically heated sintered porous channel}, author = {Hwang, G J and Wu, C C and Chao, C H}, abstractNote = {A study of non-Darcian forced convection in an asymmetric heating sintered porous channel is carried out to investigate the feasibility of using this channel as a heat sink for high Experimental investigations on single-phase convection and critical heat flux in a vertical tube with an inner diameter of mm under inlet flow oscillation conditions were carried out for the following range: ≤ G av ≤ kgm −2 s −1, ≤ P ≤ MPa, 0 In the present study, fully developed laminar flow with forced convection heat transfer of Al2O3/water and TiO2/water nanofluids inside a vertical tube subjected by constant heat flux from the Summary.

This chapter reports a survey of recent experimental work performed to obtain parametric trends of critical heat flux (CHF) in water-subcooled flow boiling, with special concern for high liquid velocity and subcooling, small-diameter channels, and low-intermediate pressure, together with a review of current modeling :// 1.

Introduction. For the research of severe accidents in nuclear power plants and the gap cooling as a possible nuclear safety application for PWR and BWP reactors, the predicting of the critical heat flux (CHF) of the natural convective boiling in vertical or inclined channels has becoming an important problem in fundamental ://   Makishi O, Honda H () Examination of minimum-heat-flux-point condition for film boiling on a sphere in terms of the limiting liquid superheat and the critical vapor film thickness.

Int J Heat Mass Trans – CrossRef Google Scholar This book comprises selected papers from the First International Conference on Convective Flow Boiling.

The purpose of the conference is to examine state-of-science and recent developments in technology of flow boiling, i.e., boiling systems which are affected by convective ://?id=gmk1OiVvSNMC.

experimental study of differences in DNB heat flux between upflow and downflow in vertical rectan-gular channel at low pressure and low mass flow rate, no remarkable differences in the DNB heat flux were observed between upflow and downflow.

Umekawa et al. (b) derived a CHF correla-tion based on the indicial response of the tube +of+the+critical+heat+flux+in+round. Although the trends were the same, the specific values of transition were not the same.

At the same heat flux, the forced convection critical Reynolds numbers were higher. For example, at a heat flux of 8 kW/m 2 the critical Reynolds number was for forced convection (vertical flow), while it was for mixed convection (horizontal flow).

The test matrix consisted of three pressures (20 kPa, 40 kPa, and kPa), three mass fluxes (45 kg/m 2-s, 90 kg/m 2-s, and kg/m 2-s), and three inlet subcoolings (0 K, 5 K, and 10 K).For each condition, once steady-state flow at the correct conditions was achieved, power was applied to the heaters embedded in the heater block to provide the desired heat flux on the :// Abstract: Experimental investigation of the critical heat flux (CHF) in smooth round tubes with circumferentially variable heating was carried out.

The riser tubes with 0, 20, degree inclinations from the horizontal were electrically heated. The measurements were carried out for pressure between 13 and 21MPa, mass flux between and kg/:// The typical sequence of flow regimes for upward flow forced convective boiling in a uniformly-heated vertical tube (q′′′ = const) is shown in Fig.

Since gravity acts parallel to the flow direction, the upward flow boiling in the tube is axisymmetric. The gravitational force plays a more dominant role while the liquid-vapor interfacial shear force is less ://   Forced-convective postcritical heat flux (CHF) heat transfer data have been obtained at low flow rates and low pressures ( to MPa) for water flowing in a vertical tube.

Significant magnitudes of superheat (up to K) were found. The steady state data are in agreement with other reported low Free-convective flows may be laminar and turbulent. A flow past a solid surface, the temperature of which is higher (lower) than that of the surrounding flowing medium, is the most widespread type of free convection.

Figures 1 and 2 schematically illustrate characteristic examples of free convection. At the beginning of heating of a vertical @article{osti_, title = {Limits to critical heat flux enhancement in a liquid film falling over a structured surface that simulates a microelectric chip}, author = {Grimley, T A and Mudawwar, I and Incropera, F P}, abstractNote = {The combination of increasing power densities and stringent surface temperature constraints for microelectric components has stimulated interest in cooling by ().

Effect of channel geometry on critical heat flux for low pressure water. EL-NAKLA a Basel I. ISMAIL. Towards understanding the critical heat flux for industrial applications. Experimental investigation of dryout of Ra, R and ethanol in vertical small diameter tubes.

(). Experiment for critical heat flux using Ra in vertical uniformly round tubes was performed and CHF data points were obtained from the present work. The investigated flow parameters in Ra was: (1) outlet pressures of 13,bar, (2) mass fluxes of – kg/m 2 s, (3) inlet subcooling temperatures of 5–40 °://An experimental investigation was conducted to measure the true quench temperature using two hot patches to anchor quench fronts.

The parametric effects of mass flux (range 50– kg m −2 s −1), inlet subcooling (2–30°C), pressure (– kPa) and local quality (− –) are discussed. Post-dryout heat transfer for vertical narrow annular channel Article in Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 35(9) September with 2 Reads