Growth rates of free vapor bubbles in liquids at uniform superheats under normal and zero gravity conditions

Florschuetz, L. W.; Henry, Christine L.; Khan, Amjad

doi:10.1016/0017-9310(69)90028-3

Cited by 70 publications

(36 citation statements)

References 16 publications

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“…The particle model is applied for the mimic of interfacial morphology and computation of interfacial area density, where the vapour is modelled as spherical bubbles. A constant number concentration is assumed, which is consistent with the experimental observation by Florschuetz et al [20] and valid for the early-stage of flashing.…”

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidsupporting

confidence: 60%

“…For large bubbles one may expect a significant under-prediction by using these models. As observed and discussed in [20,21], the influence of slip velocity on the transfer rate is noticeable even in the case of bubbles rising in stagnant superheated liquid under normal gravity. The effect of slip velocity on interfacial heat transfer was firstly studied by Ruckenstein [22] and Sideman [23].…”

Section: Convectionmentioning

confidence: 68%

“…The bubble growth rates observed by Hooper [66] were found to be lower than the theoretical ones, and moreover, the deviation increased as the superheat was increased. Florschuetz et al [20] investigated the effect of translational motion on the bubble growth rate at small superheat degrees under near zero-and normal-gravity conditions. The zero-gravity data was found to be suitable for the validation of theoretical solutions for heat-conduction controlled growth.…”

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidmentioning

confidence: 99%

“…Bubble growing in stagnant liquid of uniform superheats has been adequately studied with high speed photography around the middle of the last century [20,[65][66][67][68]. Dergarabedian [65] obtained bubble formation within the body of the liquid by heating a beaker of water slowly.…”

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidmentioning

confidence: 99%

“…Nevertheless, thermal gradients were found to exist in a narrow boundary adjacent to the bottom of the beaker, and most of the bubbles were formed in this thermal layer. Hooper [66] and Florschuetz et al [20] achieved uniform superheats by suddenly depressurizing heated pressurized water down to the atmospheric pressure within 5 ms. The bubble growth rates observed by Hooper [66] were found to be lower than the theoretical ones, and moreover, the deviation increased as the superheat was increased.…”

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidmentioning

confidence: 99%

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Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

Liao

Lucas

2018

Fluids

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Abstract:The complexity of flashing flows is increased vastly by the interphase heat transfer as well as its coupling with mass and momentum transfers. A reliable heat transfer coefficient is the key in the modelling of such kinds of flows with the two-fluid model. An extensive literature survey on computational modelling of flashing flows has been given in previous work. The present work is aimed at giving a brief review on available theories and correlations for the estimation of interphase heat transfer coefficient, and evaluating them quantitatively based on computational fluid dynamics simulations of bubble growth in superheated liquid. The comparison of predictions for bubble growth rate obtained by using different correlations with the experimental as well as direct numerical simulation data reveals that the performance of the correlations is dependent on the Jakob number and Reynolds number. No generally applicable correlations are available. Both conduction and convection are important in cases of bubble rising and translating in stagnant liquid at high Jakob numbers. The correlations combining the analytical solution for heat diffusion and the theoretical relation for potential flow give the best agreement.

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Section: Cfd Simulation Of Bubble Growth In Superheated Liquidsupporting

confidence: 60%

Section: Convectionmentioning

confidence: 68%

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidmentioning

confidence: 99%

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidmentioning

confidence: 99%

Section: Cfd Simulation Of Bubble Growth In Superheated Liquidmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

Liao

Lucas

2018

Fluids

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The motion of vapor bubbles growing in uniformly superheated liquids

Pinto

Davis

1971

AIChE Journal

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= jet radius, ft. = radius, ft. = r'/Y = surface velocity, V'?s, ft./sec. = S'/o'V = time, sec. = dt', dimensionless time or rotational angle = velocity normal to surface, ft./sec. = radial velocity, ft./sec. = V', /O'Y = average velocity at vane origin, ft./sec. = axial distance in jet Greek Letters p' 7' 4 5 = angular velocity, rad./sec. = liquid density, Ib.,/cu. ft. = shear stress, Ib.f/sq. ft. = kinematic viscosity, sq. ft./sec. = viscosity, 1b.J (ft.) (sec.) Su bscriptr r, h = coordinate directions 0 = vane origin 1 = vane exit S = surfaceThe motion of simultaneously rising and growing vapor bubbles i n a uniformly superheated liquid is analyzed, and the predicted bubble velocities are shown t o be i n good agreement with available data. Using a quasisteady state approximation to describe the drag, and existing bubble growth theory t o describe the growth rate, the equation of motion i s solved for two ranges of bubble size encountered i n nucleate boiling. For smaller bubbles (R<0.04 cm.) an analytical solution is obtained, and for larger bubbles (R>0.07 cm.) a numerical solution and analytical asymptotic solutions are obtained.

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Formation and Structure

Bikerman¹

1973

Foams

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Growth rates of free vapor bubbles in liquids at uniform superheats under normal and zero gravity conditions

Cited by 70 publications

References 16 publications

Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

The motion of vapor bubbles growing in uniformly superheated liquids

Formation and Structure

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