Numerical Analysis of Bubble Growth and Departure from a Microcavity

Lee, Woorim; Son, Gihun; Jeong, Jae Jun

doi:10.1080/10407790.2010.522871

Cited by 22 publications

(20 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As discussed by Dhir [161],measurement difficulties, prediction inaccuracies, and lack of generality associated with the effort to correlate nucleate boiling mechanisms over the last half of the twentieth century, viz. nucleation site density, bubble departure diameter, and bubble departure frequency, has spurred recent investigation of direct simulation of vapor bubble growth during nucleate boiling from flat surfaces [162][163][164][165][166][167][168][169]. Reports of similar approaches in the presence of porous structures are limited.…”

Section: Boiling In the Wick Structurementioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

View full text Add to dashboard Cite

Owing to their high reliability, simplicity of manufacture, passive operation, and effective heat transport, flat heat pipes and vapor chambers are used extensively in the thermal management of electronic devices. The need for concurrent size, weight, and performance improvements in high-performance electronics systems, without resort to active liquid-cooling strategies, demands passive heat spreading technologies that can dissipate extremely high heat fluxes from small hot spots. In response to these daunting application-driven trends, a number of recent investigations have focused on the design, characterization, and fabrication of ultra-thin vapor chambers for proximate heat spreading away from these hot spots. The predominant transport mechanisms and operational limits have been found to be different under these conditions relative to conventional low-power heat pipes. Noteworthy advances in the fundamental understanding of evaporation and boiling from porous microstructures fed by capillary action, and improvements in vapor chamber characterization, modeling, design, and fabrication techniques are reviewed. Characterization of evaporation and boiling from idealized and realistic wick structures, observation of vapor formation regimes as a function of operating conditions, assessment of fluid dryout limitations, design of novel multi-scale and nanostructured wicks for enhanced transport, and incorporation of these high heat flux transport phenomena into device-level models are discussed. These recent developments have successfully extended the maximum operating heat flux limits of vapor chambers.2

show abstract

Section: Boiling In the Wick Structurementioning

confidence: 99%

Recent Advances in Vapor Chamber Transport Characterization for High-Heat-Flux Applications

Weibel

Garimella

2013

Advances in Heat Transfer

View full text Add to dashboard Cite

show abstract

“…As large topological changes are crucial for phase change problems, many researchers have turned to the front capturing methods due to their versatility in complex interface deformation. In [7], Welch and Wilson on a horizontal cylinder [11], nucleate boiling in microcavity [12] and flow boiling in a finned microchannel [13]. Gada and Sharma [55] proposed a method called a dual-grid level set method that uses two mesh sizes.…”

Section: Literature Review On the Numerical Studies Of Multiphase Flomentioning

confidence: 99%

“…The work in [10] used the ghost fluid and the level set methods for phase change simulations. A similar approach was adopted in [11] to study various boiling problems including three-dimensional film boiling on a horizontal cylinder, nucleate boiling in microcavity [12] and flow boiling in a finned microchannel [13].…”

mentioning

confidence: 99%

Direct numerical simulation of incompressible multiphase flow with phase change

Lee

Riaz

Aute

2017

Journal of Computational Physics

View full text Add to dashboard Cite

Phase change problems arise in many practical applications such as air-conditioning and refrigeration, thermal energy storage systems and thermal management of electronic devices.The physical phenomenon in such applications are complex and are often difficult to be studied in detail with the help of only experimental techniques. The efforts to improve computational techniques for analyzing two-phase flow problems with phase change are therefore gaining momentum.The development of numerical methods for multiphase flow has been motivated generally by the need to account more accurately for (a) large topological changes such as phase breakup and merging, (b) sharp representation of the interface and its discontinuous properties and (c) accurate and mass conserving motion of the interface. In addition to these considerations, numerical simulation of multiphase flow with phase change introduces additional challenges related to discontinuities in the velocity and the temperature fields. Moreover, the velocity field is no longer divergence free. For phase change problems, the focus of developmental efforts has thus been on numerically attaining a proper conservation of energy across the interface in addition to the accurate treatment of fluxes of mass and momentum conservation as well as the associated interface advection.Among the initial efforts related to the simulation of bubble growth in film boiling applications the work in [1] was based on the interface tracking method using a moving unstructured mesh. That study considered moderate interfacial deformations. A similar problem was subsequently studied using moving, boundary fitted grids Among the front capturing methods, sharp interface methods have been found to be particularly effective both for implementing sharp jumps and for resolving the interfacial velocity field. However, sharp velocity jumps render the solution susceptible to erroneous oscillations in pressure and also lead to spurious interface velocities. To implement phase change, the work in [16] employed point mass source terms derived from a physical basis for the evaporating mass flux. To avoid numerical instability, the authors smeared the mass source by solving a pseudo time-step diffusion equation. This measure however led to mass conservation issues due to non-symmetric integration over the distributed mass source region. The problem of spurious pressure oscillations related to point mass sources was also investigated by [17]. Although their method is based on the VOF, the large pressure peaks associated with sharp mass source was observed to be similar to that for the interface tracking method.Such spurious fluctuation in pressure are essentially undesirable because the effect is globally transmitted in incompressible flow. Hence, the pressure field formation due to phase change need to be implemented with greater accuracy than is reported in current literature.The accuracy of interface advection in the presence of interfacial mass flux (mass flux conservation) has been discussed in [14,18]. ...

show abstract

“…The sharp-interface LS formulation modified by Lee et al [17] for computation of bubble growth and departure from a microcavity is extended for nucleate boiling enhancement on a microstructured surface. Fig.…”

Section: Numerical Analysismentioning

confidence: 99%

“…Son and Dhir [16] employed the LS method to investigate the effects of wall superheat and number density of nucleation sites observed in nucleate boiling at high heat fluxes. Very recently, Lee et al [17] extended the LS method to computation of bubble growth on a solid surface with immersed (or irregularly shaped) structures such as microcavities.…”

Section: Introductionmentioning

confidence: 99%