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Keywords: nucleation
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Journal Articles
Article Type: Research-Article
J. Heat Transfer. July 2014, 136(7): 072101.
Paper No: HT-13-1165
Published Online: April 9, 2014
... rotating wheel, along with theoretical estimates of melt ribbon thickness, to investigate dynamical characteristics of the flow in melt pool. The nucleation temperature and the critical cooling rate are predicted in the paper for alloy Fe 75 –Si 10 –B 15 (at. %). Thermal conduction is found to dominate...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. November 2012, 134(11): 112902.
Published Online: September 28, 2012
... to 8100 fps) and long-range microscopy are used to document bubble dynamics. Boiling mechanisms inherent to subcooling, enhanced surface geometry, and CHF are discussed. flow boiling enhanced surface structured-porous subatmospheric pressure high heat flux water nucleation structured-porous...
Journal Articles
Article Type: Evaporation, Boiling, and Condensation
J. Heat Transfer. July 2012, 134(7): 071501.
Published Online: May 18, 2012
... to 10,000. Influences of system pressure, flow rate, and pore sizes (mesh number) on flow boiling performance were investigated. The mechanisms for the influences were discussed. 14 02 2011 23 01 2012 17 05 2012 18 05 2012 flow boiling nucleation structured porous fin wire...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. November 2011, 133(11): 111501.
Published Online: August 31, 2011
... at low heat fluxes is due to the fact that the effect of formation of thin sorption layer of nanoparticles on heater surface, which causes deterioration by trapping the nucleation sites, is overshadowed by the increase in microlayer evaporation, which is due to enhancement in thermal conductivity. Same...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. October 2011, 133(10): 101506.
Published Online: August 23, 2011
...A. Sathyabhama; T. P. Ashok Babu Visualization of bubble nucleation during nucleate pool boiling outside a vertical cylindrical heated surface was done for ammonia-water binary mixture in order to obtain a descriptive behavior of the boiling, which was directly compared with the measured heat...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2011, 133(4): 041501.
Published Online: January 6, 2011
...Sean J. Penley; R. A. Wirtz Saturated pool-boiling experiments at 1 atm and subatmospheric pressure assess the utility of fine-filament screen-laminate enhanced surfaces as effective bubble nucleation sites. Experiments were conducted on vertically oriented, multilayer laminates in saturated...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. February 2011, 133(2): 021501.
Published Online: November 3, 2010
... 2010 chemical vapour deposition condensation contact angle drops glass nucleation dropwise condensation chemical texturing pendant droplets modeling and simulation imaging It is well known that the heat transfer coefficient during dropwise condensation is several times...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2010, 132(12): 122901.
Published Online: September 22, 2010
... drastically due to the radiation absorbed by the carbon particles and additional nucleation sites formed by carbon particles for heterogeneous decomposition reaction. The present study numerically tries to investigate the above fact by tracking carbon particles in a Lagrangian framework. The results...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. September 2010, 132(9): 094503.
Published Online: July 15, 2010
... condensation form is still not clear. We suggest a condensation model based on droplet nucleation and growth on elevated precipitates, resulting in short-term steam entrapment after droplet coalescence. According to the wetting theory, this transition state yields increased macroscopic contact angles...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2010, 132(4): 041002.
Published Online: February 17, 2010
... flow, and the wavy-annular flow. The interaction of the bubble with the pin fins during nucleate boiling from G = 350 kg / m 2 s to G = 827 kg / m 2 s and wall heat fluxes from 10 W / cm 2 to 110 W / cm 2 is detailed. 18 01 2008 12 08 2008 17 02 2010 17 02 2010 bubbles flow...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2010, 132(3): 031501.
Published Online: December 29, 2009
... characteristics have been identified and the optimal enhancement requires a balance of the active nucleation sites, bubble flow resistance, natural convection, thin film evaporation, liquid superheating, heat transfer area, bubble coalescence, and liquid reflux resistance. High speed visualization of vapor plug...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2009, 131(12): 121014.
Published Online: October 15, 2009
.... 121013 ) is verified in this part. In the first step, the model is examined by experiments conducted using R134a covering a range of pressures, inlet subcoolings, and flow velocities. The density of the active nucleation sites is measured and correlated with critical diameter D c and static contact angle...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. October 2009, 131(10): 101010.
Published Online: July 31, 2009
... a significant change in the nucleate boiling mechanism, which accounted for the largest effect on the heat transfer performance. Thome , J. , 1990 , Enhanced Boiling Heat Transfer , Hemisphere , New York . Bergles , A. E. , 1997 , “ Enhancement of Pool Boiling ,” Int. J. Refrig. 0140...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. September 2009, 131(9): 091502.
Published Online: June 25, 2009
... 25 06 2009 boiling bubbles capillarity convection nucleation organic compounds surface tension zero gravity experiments boiling variable gravity microgravity thermocapillary convection dissolved gas heater size A plot of q b ″ versus acceleration during...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. September 2009, 131(9): 091001.
Published Online: June 19, 2009
... the bubble formation at the nucleation sites, and significantly improve the nucleate boiling heat transfer. Experiments revealed that its boiling heat transfer enhancement is comparable or in some respect even superior to the commercially available boiling heat transfer enhancement surfaces such as porous...
Journal Articles
Article Type: Micro/Nanoscale Heat Transfer—Part Ii
J. Heat Transfer. April 2009, 131(4): 043202.
Published Online: February 11, 2009
...Jadran Vrabec; Martin Horsch; Hans Hasse Homogeneous nucleation processes are characterized by the nucleation rate and the critical droplet size. Molecular dynamics simulation is applied for studying homogeneous nucleation during condensation of supersaturated vapors of methane and ethane...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. July 2008, 130(7): 072402.
Published Online: May 16, 2008
... were conducted using three types of 200 × 253 μ m 2 parallel microchannel devices: with reentrant cavity surface, with interconnected reentrant cavity surface, and with plain surface. The onset of nucleate boiling, CHF condition, and local temperature measurements were obtained and compared in order...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. June 2008, 130(6): 062401.
Published Online: April 23, 2008
... of the electron gas and transferred to the lattice. The energy equations for the electron and lattice were coupled through an electron-lattice coupling factor. Melting and resolidification were modeled by considering the interfacial energy balance and nucleation dynamics. An iterative solution procedure...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2008, 130(4): 042411.
Published Online: March 21, 2008
...Brian R. Novak; Edward J. Maginn; Mark J. McCready Heterogeneous bubble nucleation was studied on surfaces having nanometer scale asperities and indentations as well as different surface-fluid interaction energies. Nonequilibrium molecular dynamics simulations at constant normal stress and either...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. December 2007, 129(12): 1737–1741.
Published Online: March 27, 2007
... not correspond to the steady state. The present modeling by CML is based on the assumption that the flow boiling is governed by (i) nucleation from cavities on the heated surface and migration of vapor into the core, (ii) forced convection, and (iii) phase change in the fluid bulk and mixing. The stirring action...