Comparison of Experimental Microlayer Thickness Results

1972 ◽  
Vol 1 (3) ◽  
pp. 168-170
Author(s):  
R.L. Judd
Keyword(s):  
Glass Surface ◽  
Nucleate Boiling ◽  
Experimental Results ◽  
Vapour Bubble ◽  
Interferometric Study

The results of an interferometric study of the thickness of the microlayer underlying a dichloromethane vapour bubble which was observed during saturated nucleate boiling on a glass surface are reported. These results are compared with the experimental results of two other investigators.

Flow Analyses Using RELAP/MOD3.3 Code for the Simulant Melt Experiments (LAVA-ERVC) Under the External Reactor Vessel Cooling

2004 ◽  
Author(s):  
Kyoung-Ho Kang ◽  
Rae-Joon Park ◽  
Sang-Baik Kim ◽  
Hee-Dong Kim
Keyword(s):  
Heat Transfer ◽  
Free Volume ◽  
Boiling Heat Transfer ◽  
Nucleate Boiling ◽  
Flow Path ◽  
Reactor Vessel ◽  
Experimental Results ◽  
Nucleate Boiling Heat Transfer ◽  
Sensitivity Studies

Flow analyses using RELAP5/ MOD3.3 code have been performed to investigate the occurrence and the effects of steam binding for the LAVA-ERVC experiments. The main objectives of the LAVA-ERVC experiments are investigations of coolability through external reactor vessel cooling according to RPV insulation design. It could be found from the sensitivity studies for the flow path in the annulus of insulation that steam binding could occur in case of the limited steam venting capacity, which is definitely coincident with the LAVA-ERVC experimental results. In case of sufficient flow path for the steam venting, the vessel experienced effective cooling by nucleate boiling heat transfer. And existence of the upper free volume had little effect on occurrence of steam binding in the LAVA-ERVC experiments.

Nucleate Boiling on an Oxide Coated Glass Surface

1975 ◽  
Vol 97 (3) ◽  
pp. 494-495 ◽  
Author(s):  
R. L. Judd ◽  
M. S. M. Shoukri
Keyword(s):  
Glass Surface ◽  
Nucleate Boiling ◽  
Coated Glass

Nucleate Boiling Performance of Refrigerants and Refrigerant-Oil Mixtures

1980 ◽  
Vol 102 (4) ◽  
pp. 701-705 ◽  
Author(s):  
S. Chongrungreong ◽  
H. J. Sauer
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Significant Influence ◽  
Correlation Equation ◽  
Nucleate Boiling ◽  
Experimental Results ◽  
General Correlation ◽  
Oil Mixtures ◽  
The Heat Transfer Coefficient

Current and previous studies by the authors and others have shown shown that the carryover of oil in refrigeration systems can have a significant influence on the boiling performance in the evaporator of refrigeration systems. This investigation was conducted primarily to develop a general correlation equation for predicting the heat transfer coefficient for refrigerants and refrigerant-oil mixtures under pool boiling conditions. Experimental results were obtained to establish the validity of the correlation equation.

The Role of Bubble Waiting Time in Steady Nucleate Boiling

1999 ◽  
Vol 121 (4) ◽  
pp. 852-855 ◽  
Author(s):  
R. L Judd
Keyword(s):  
Waiting Time ◽  
Nucleate Boiling ◽  
Nucleation Site ◽  
Experimental Results ◽  
Sufficient Energy ◽  
Time Required

Experimental results previously reported by Ibrahim and Judd were examined in order to determine the role of bubble waiting time in steady nucleate boiling. The analysis identified that the time elapsed between the formation of bubbles at a nucleation site is the time required for the liquid which replaced the previous bubble to acquire sufficient energy to sustain the growth of the subsequent bubble, and not the time required to establish the conditions required to enable the nucleus, which formed at the nucleation site, to commence growing into a bubble.

Biofunctionalization of Glass Powder by Cold-Plasma Technique

2005 ◽  
Vol 498-499 ◽  
pp. 594-599 ◽  
Author(s):  
Odilio B.G. Assis ◽  
Leonardo G. Paterno
Keyword(s):  
Glass Surface ◽  
Cold Plasma ◽  
Glass Powder ◽  
Experimental Results ◽  
Plasma Technique ◽  
Irregular Shapes ◽  
Functionalized Materials ◽  
Subsequent Chemical

The present work deals with cold plasma organosilicon treatment of glass powder surfaces. The treated material underwent subsequent chemical derivations by storing samples inside an evacuated chamber, allowing chemical penetration at controlled pressures. The radicals’ inductions were characterized by XPS within each stage of modification. The enzyme peroxidase was immobilized using functionalized materials to check the resultant biocompatibility. A sequence of surface tailoring is proposed suggesting the anchoring of enzyme via C = O groups implanted on the glass surface. The experimental results demonstrate that the proposed process is suitable for the functionalization of materials with irregular shapes.

Bubble Dynamics for Nucleate Pool Boiling of Electrolyte Solutions

2010 ◽  
Vol 132 (8) ◽  
Author(s):  
Seyed Ali Alavi Fazel ◽  
Seyed Baher Shafaee
Keyword(s):  
Experimental Data ◽  
Bubble Dynamics ◽  
Pool Boiling ◽  
Close Relation ◽  
Electrolyte Solutions ◽  
Nucleate Boiling ◽  
Heat Fluxes ◽  
Experimental Results ◽  
Nucleate Pool Boiling ◽  
Wide Range

Bubble dynamics is the most important subphenomenon, which basically affects the nucleate pool boiling heat transfer coefficient. Previous investigations state that the effect of physical properties of liquid and vapor phases on bubble departure diameter are often conflicting. In this article, extensive new experimental data are presented for the bubble departure diameter for various electrolyte aqueous solutions over a wide range of heat fluxes and concentrations. Experimental results show that the bubble detachment diameter increase with increasing either boiling heat flux or electrolyte concentration. Experimental results also present a close relation between the dimensionless capillary and bond numbers. A new model for the prediction of vapor bubble departure diameter in nucleate boiling for the electrolyte solutions is proposed, which predicts the experimental data with a satisfactory accuracy.

Ultraprecision Glass Molding Press for Microgrooves with Different Pitch Sizes

2013 ◽  
Vol 7 (6) ◽  
pp. 678-685 ◽  
Author(s):  
Ryuichi Kobayashi ◽  
◽  
Tianfeng Zhou ◽  
Keita Shimada ◽  
Masayoshi Mizutani ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Glass Surface ◽  
Fem Simulation ◽  
Experimental Results ◽  
Experimental Conditions ◽  
Glass Molding ◽  
Periodic Microstructures ◽  
Simulation Results ◽  
Efficient Manufacturing

Glass molding press is an efficient manufacturing technology to fabricate microstructures on glass. To optimize the experimental conditions for precision replication of periodic microstructures with different pitch sizes, Finite Element Method (FEM) simulation and experiments were carried out to study the glass molding press process. First, the effects of the change in pitch size on stress and geometrical replicating accuracy were evaluated. Thereafter, glass molding experiments were carried out to form microstructures on the glass surface, and the molded microstructures were measured. By comparing the simulation results with experimental results, the FEM simulation was experimentally verified, and the optimal machining conditions were obtained and discussed.

Simulation of Subcooled Nucleate Boiling in a Vertical Annulus With Coupling of Bubble-Tracking and Two-Fluid Models: Further Comparison With Experimental Results

2006 ◽  
Author(s):  
Ivo Kljenak ◽  
Bosˇtjan Koncˇar ◽  
Borut Mavko
Keyword(s):  
Fluid Model ◽  
Three Dimensional ◽  
Vertical Channel ◽  
Nucleate Boiling ◽  
Bubble Nucleation ◽  
Experimental Results ◽  
Tracking Model ◽  
Two Fluid Model ◽  
Vertical Annulus ◽  
Two Fluid

A model of subcooled nucleate boiling flow in a vertical channel at low pressure conditions that was developed earlier is further validated by comparison of simulations with experimental results from Purdue University (USA). The model consists of a three-dimensional bubble-tracking model and a two-dimensional two-fluid model which are coupled off-line. By taking into account dynamic phenomena (liquid flow, bubble motion and interaction) and thermal phenomena (liquid heating, bubble nucleation and condensation), the model is able to simulate the gradual evolution of void fraction profiles along the boiling channel.

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