Journal ArticleDOI
A Theoretical model to predict pool boiling CHF incorporating effects of contact angle and orientation
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In this paper, a theoretical model is developed to describe the hydrodynamic behavior of the vapor-liquid interface of a bubble at the heater surface leading to the initiation of critical heat flux (CHF) condition.Abstract:
A theoretical model is developed to describe the hydrodynamic behavior of the vapor-liquid interface of a bubble at the heater surface leading to the initiation of critical heat flux (CHF) condition. The momentum flux resulting from evaporation at the bubble base is identified to be an important parameter. A model based on theoretical considerations is developed for upward-facing surfaces with orientations of 0 deg (horizontal) to 90 deg (vertical). It includes the surface-liquid interaction effects through the dynamic receding contact angle. The CHF in pool boiling for water, refrigerants and cryogenic liquids is correctly predicted by the model, and the parametric trends of CHF with dynamic receding contact angle and subcooling are also well representedread more
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Structured surfaces for enhanced pool boiling heat transfer
TL;DR: In this paper, surface roughness-augmented wettability on critical heat flux (CHF) during pool boiling with horizontally oriented surfaces was investigated, and an analytical force-balance model was extended to explain the CHF enhancement.
Journal ArticleDOI
Heat Transfer Mechanisms During Flow Boiling in Microchannels
TL;DR: In this paper, the authors analyzed the forces due to surface tension and momentum change during evaporation in microchannels and derived two new non-dimensional groups, K1 and K2, relevant to flow boiling.
Journal ArticleDOI
Role of wickability on the critical heat flux of structured superhydrophilic surfaces
TL;DR: Biological templates have been used to demonstrate that wickability is the single factor dictating CHF on structured superhydrophilic surfaces and provides a framework for designing and optimizing coatings for further enhancement.
Journal ArticleDOI
Nanoengineered materials for liquid–vapour phase-change heat transfer
TL;DR: In this article, the authors present an overview of the surface, thermal and material science to illustrate how new materials and designs can improve boiling and condensation, and focus on nanoengineered materials, with emphasis on further improving the heat-transfer performance and long-term robustness.
Journal ArticleDOI
Review of pool boiling enhancement by surface modification
TL;DR: In this paper, a comprehensive review of published articles addressing passive enhancement of pool boiling using surface modification techniques is provided, including macroscale, microscale, and nanoscale surfaces, as well as multiscale (hybrid-scale), and hybrid-wettability techniques.
References
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ReportDOI
Hydrodynamic Aspects of Boiling Heat Transfer
TL;DR: In this paper, the critical heat flux and the minimum heat flux are derived from these hydrodynamic limits, and results of investigations of nucleate boilin g are discussed and the theory of bubble growth is extended to include the effect of nonuniform temperature fields.
Journal ArticleDOI
A new hydrodynamic model of critical heat flux, applicable widely to both pool and forced convection boiling on submerged bodies in saturated liquids
Y. Haramura,Yoshiro Katto +1 more
TL;DR: In this article, the critical heat flux (CHF) was introduced for columnar vapor stems distributed in a liquid layer wetting a heated surface, and a new hydrodynamic model was developed for pool boiling and forced convection boiling.
Journal ArticleDOI
The maximum and minimum values of the heat Q transmitted from metal to boiling water under atmospheric pressure
TL;DR: In this paper, the authors show that the quantity of heat transmitted from a metal surface to boiling water increases as the temperature difference ΔT is increased, but after the ΔT has reached a certain limit, quantity Q decreases with further increase in ΔT.
Journal ArticleDOI
The mechanism of heat transfer in nucleate pool boiling—Part I: Bubble initiaton, growth and departure
Han Chi-Yeh,Peter Griffith +1 more
TL;DR: In this article, a criterion for bubble initiation from a gas filled cavity on a surface in contact with a superheated layer of liquid was developed, and it was found that the temperature of bubble initiation on a given surface is a function of the temperature conditions in the liquid surrounding the cavity as well as the surface properties themselves.
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A new hydrodynamic model of critical heat flux, applicable widely to both pool and forced convection boiling on submerged bodies in saturated liquids
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