Heat transfee with evaporation and boiling of a liquid in porous bodies

Abramenko, A. N.; Kanonchik, L. E.; Shashkov, A. G.; Sheleg, V. K.

doi:10.1007/bf00827259

Cited by 1 publication

(3 citation statements)

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“…Typical measured boiling curves. Fiber diameter was 18.5 pm, porosity was 0.946, and permeability was 5.4x 0-10 m. 2 the ability of the heater to supply heat, which is related to nucleation characteristics of the heater surface. Apparently, some form of active nucleation is occurring at voids on the heater surface, within limits posed by physical constraints of the pore structure.…”

Section: Qualitative Description Of the Phenomenamentioning

confidence: 99%

“…Phase-change heat transfer thus plays an important role. As illustrated in Figure 1, heat transferred to the moist web of paper during impulse drying peaks at instantaneous heat fluxes on the order of 3.0 MW/m 2 (Lavery, 1988). The displacement-augmented dewatering process yields sheet solids contents prior to the dryer section ranging from 55 to 70%.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of porous media on the mechanism of boiling heat transfer phenomena have been investigated for a number of different media/surface configurations (Costello and Redeker, 1963;Cornwell, et al, 1976;Rannenberg and Beer, 1980;Baum and Greaney, 1981;Abramenko, et al, 1982;Fukusako, et al, 1983;Fukusako, et al, 1986;Chuah and Carey, 1987). Typically, the porous medium is composed of small spheres of various materials, or of fibrous wicking materials, particularly for studies of heat pipes.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of Boiling Heat Transfer in Fibrous Porous Media

Rudemiller¹,

Lindsay²

1990

Proceeding of International Heat Transfer Conference 9

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Boiling phenomena are investigated in the presence of porous media composed of ceramic fibers ranging in diameter from 3.0 to 18.5 im for system pressures ranging from 0.18 to 0.28 MPa. Bed porosities range from 0.935 to 0.95, average pore diameters range from 30 to 250 ;m, and permeabilities range from 2 x 10-11 to 6 x 10-9 m 2. For surface temperatures up to 400°C, measured boiling curves for water in the different fiber beds show maximum heat fluxes on the order of 25 W/cm 2. The boiling curves exhibit two distinct regimes-a nucleate-type regime and a constant heat flux regime. In the nucleate-type regime, heat flux is directly related to wall superheat, and the slope is directly related to the average pore diameter of the bed. In the constant flux regime, heat flux is independent of wall superheat, as heat transfer is governed by the rate at which the fiber bed supplies water to the heater surface. The transition region can exhibit a peak heat flux and associated rapid escalation in surface temperature similar to burnout in classical pool boiling. Correlations based on dimensional analysis are presented for both regimes. Data in the constant flux regime are fitted to ± 35%, but data in the nucleate-type regime are only fitted to ± 175%.

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Section: Qualitative Description Of the Phenomenamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%