Apparatus for investigating boiling phenomena in a fibrous porous medium

Rudemiller, Gary R.; Lindsay, Jeffrey D.

doi:10.1016/0735-1933(89)90004-3

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…This issue is due to the changing of properties of heat transfer surface, because of the sedimentation of nanoparticles and creation of the thin film layer on the heater surface. Rudemiller (1989), in a research about boiling phenomenon, studied the phase changing in a porous medium. In the mentioned study, the porous surface has been considered to be made of ceramics.…”

Section: Introductionmentioning

confidence: 99%

Eulerian–Eulerian multi-phase RPI modeling of turbulent forced convective of boiling flow inside the tube with porous medium

Azadbakhti

Pourfattah

Ahmadi

et al. 2019

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Purpose The purpose of this study is simulation the flow boiling inside a tube in the turbulent flow regime for investigating the effect of using a porous medium in the boiling procedure. Design/methodology/approach To ensure the accuracy of the obtained numerical results, the presented results have been compared with the experimental results, and proper coincidence has been achieved. In this study, the phase change phenomenon of boiling has been modeled by using the Eulerian–Eulerian multi-phase Rensselaer Polytechnic Institute (RPI) wall boiling model. Findings The obtained results indicate using a porous medium in boiling process is very effective in a way that by using a porous medium inside the tub, the location of changing the liquid to the vapor and the creation of bubbles, changes. By increasing the thermal conductivity of porous medium, the onset of phase changing postpones, which causes the enhancement of heat transfer from the wall to the fluid. Generally, it can be said that using a porous medium in boiling flows, especially in flow with high Reynolds numbers, has a positive effect on heat transfer enhancement. Also, the obtained results revealed that by increasing Reynolds number, the created vapor phase along the tube decreases and by increasing Reynolds number, the Nusselt number enhances. Originality/value In present research, by using the computational fluid dynamics, the effect of using a porous medium in the forced boiling of water flow inside a tube has been investigated. The fluid boiling inside the tube has been simulated by using the multi-phase Eulerian RPI wall boiling model, and the effect of thermal conductivity of a porous medium and the Reynolds number on the flow properties, heat transfer and boiling procedure have been investigated.

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Section: Introductionmentioning

confidence: 99%

Eulerian–Eulerian multi-phase RPI modeling of turbulent forced convective of boiling flow inside the tube with porous medium

Azadbakhti

Pourfattah

Ahmadi

et al. 2019

HFF

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“…Similarly, the increase in heat transfer per pressure drop unit occurs in a porosity ratio of 0.7. Rudemiller et al [12] studied a phase change in a porous medium. The results showed that the porous medium has a great influence on heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of the Porous Plates on the Tank Bottom on the Boiling Process

Nourbakhsh¹,

Bayareh²

2019

Journal of Thermal Engineering

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In the present study, the boiling process is simulated in a fixed-temperature tank using the ANSYS FLUENT commercial software. Eulerian method is used to simulate the condensation and evaporation processes. The effect of porous media on the boiling process is investigated. For this purpose, a porous medium with different porosity coefficients is placed on the bottom of the tank and its effect on the bubble dynamics and wall thermal flux is investigated. The simulation is carried out in two dimensions and is considered as unstable. The results show that the porosity coefficient of the porous medium affects the bubble dynamics. The process of phase change decreases by decreasing porosity. Also, the growth rate of the bubble phase in the tank increases with increasing the heat transfer coefficient of the porous medium.

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“…To achieve a better understanding of the role of boiling heat transfer in impulse drying, this research addresses the effects of a fibrous medium possessing significant capillary forces on the characteristic boiling curve over a broad range of surface temperature. The experimental apparatus designed to gather data for boiling of water in a fibrous medium, illustrated in Figure 2, is discussed in detail elsewhere (Rudemiller, 1989;Rudemiller and Lindsay, 1989). Briefly, the boiling cell apparatus is composed of four systems: the boiling cell, the heat supply system, the data acquisition system, and the process control system.…”

Section: Introductionmentioning

confidence: 99%

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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Apparatus for investigating boiling phenomena in a fibrous porous medium

Cited by 4 publications

References 8 publications

Eulerian–Eulerian multi-phase RPI modeling of turbulent forced convective of boiling flow inside the tube with porous medium

Eulerian–Eulerian multi-phase RPI modeling of turbulent forced convective of boiling flow inside the tube with porous medium

Study of the Effect of the Porous Plates on the Tank Bottom on the Boiling Process

An Investigation of Boiling Heat Transfer in Fibrous Porous Media

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