Heat Transfer Characteristics of Regenerator Matrix : Case of Packed Wire Gauzes

Hamaguchi, Kazuhiro; Takahashi, Shun; Miyabe, Hideya

doi:10.1299/kikaib.49.2001

Cited by 19 publications

(3 citation statements)

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“…On the other hand, there exist two different procedures with respect to the steady methods: one is to determine h v so as to reproduce experimentally obtained local wall heat transfer coefficient of a heated porous channel and another is to determine h v through a heat balance of an electrically heated metallic porous medium. So far many authors, including Choudhury [3], Hamaguchi et al [4], Kondoh et al [5], Younis and Viskanta [6], Fu et al [7], Ichimiya [8], and Kamiuto et al [9] reported experimental data of the volumetric heat transfer coefficients of cellular porous media. Among these, only Kondoh et al [5] and Ichimiya [8] adopted the steady methods and the others utilized the unsteady method.…”

Section: Derivation Of Heat Transfer Correlationsmentioning

confidence: 99%

“…Considerable efforts to determine the volumetric heat transfer coefficient between air and open-cell foams [3][4][5][6][7][8][9] and to derive dimensionless heat transfer correlations have been made during the recent few decades, but a general Nusselt versus Reynolds number heat transfer correlation covering experimental data obtained by many researchers has not yet been established. To establish such a general heat transfer correlation, it is most important to select appropriate characteristic lengths of open-cellular porous materials.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer correlations for open-cellular porous materials

Kamiuto

Yee²

2005

International Communications in Heat and Mass Transfer

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Section: Derivation Of Heat Transfer Correlationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat transfer correlations for open-cellular porous materials

Kamiuto

Yee²

2005

International Communications in Heat and Mass Transfer

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“…A transient single-blow technique has been commonly used for determining the NTU value of a compact heat exchanger [I-6] and the regenerator of cryocooler [7][8]. The single-blow technique requires a steady fluid flow passing through the test heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

An improved model for the single-blow measurement including the non-adiabatic side wall effect

Chen

Chang

1996

International Communications in Heat and Mass Transfer

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Similarity rule between heat transfer and pressure drop of porous materials

1992

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Porous materials are used for many engineering components such as the fixed bed for chemical reactors, the regenerator of the Stirling engine, and the pebble bed of the high-temperature gas-cooled nuclear reactor.In general, the heat-transfer and pressure-drop characteristics of porous materials cannot be easily specified, except for the fixed beds of uciform, simply-shaped particles of spheres and cylindrical beads. For these simple particles, the characteristic length is usually defined by the diameter d or 6V/S, which characterizes the heat-transfer and/or pressure-drop properties. However, it is difficult to define it for the porous materials of complex matrices such as foamed metal, fixed beds of nonuniform, and irregularly shaped particles. Thus, for porous materials without sufficient knowledge of its fine structures, experiments are carried out to get information on heat-transfer and/or pressure-drop characteristics. The purpose of this work is to predict the heat-transfer characteristics from the pressure drop data, since heat-transfer experiments are much more difficult.Much research has been carried out on heat-transfer (Dhingra, 1984;Dixon, 1979;Kudra, 1989) or on pressure-drop characteristics of porous materials (Comite, 1989;Burke, 1928;Ergun, 1949). However, studies that deal with both heat-transfer and pressure-drop characteristics simultaneously are rather scarce. Hamaguchi (1983) adopted mean bore diameter as the characteristic length of the porous metal for pressure drop and mean fiber diameter for heat transfer to yield fairly good correlations. If this choice of characteristic lengths is the best and no other alternative exists, no similarity rule is expected since the bore diameter and the fiber diameter are independent of each other. Unfortunately, Hamaguchi's (1983) experiments are not broad enough to determine the possibility of the existence of the similarity rule. Chiou (1966) tried to define the characteristic length from the pressure-drop data to correlate the heat-transfer data. This is very similar to our approach; however, his results do not seem to be good due to the improper choice of the characteristic length, as will be discussed later.Correspondence concerning this work should be directed to K. Fukuda. T. Kondoh is currently at the Toa University, Shirnonoseki 751, Japan; S. Hasegawa at the Kurume College of Technology, Kururne 830, Japan.This work shows that a proper characteristic length is determined by defining the Reynolds number Re and the Nusselt number Nu. Then a universal law or a similarity rule Nu = f ( R e ) applicable to various porous materials is derived.

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Heat Transfer Characteristics of Regenerator Matrix : Case of Packed Wire Gauzes

Cited by 19 publications

References 0 publications

Heat transfer correlations for open-cellular porous materials

Heat transfer correlations for open-cellular porous materials

An improved model for the single-blow measurement including the non-adiabatic side wall effect

Similarity rule between heat transfer and pressure drop of porous materials

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