Optical Study of Bubble Dynamics in Microgravity Pool Boiling

1999 ◽  
pp. 121-138
Author(s):  
Johannes Straub
Keyword(s):  
Bubble Dynamics ◽  
Pool Boiling ◽  
Optical Study

Pool boiling performance and bubble dynamics on graphene oxide nanocoating surface

2020 ◽  
Vol 147 ◽  
pp. 106154 ◽  
Author(s):  
Lan Mao ◽  
Wenbin Zhou ◽  
Xuegong Hu ◽  
Yu He ◽  
Guiying Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Bubble Dynamics ◽  
Pool Boiling

Photographic study of bubble dynamics for pool boiling of refrigerant R11

2006 ◽  
Vol 43 (9) ◽  
pp. 935-947 ◽  
Author(s):  
Yan-Hua Diao ◽  
Yao-Hua Zhao ◽  
Qiu-Liang Wang
Keyword(s):  
Bubble Dynamics ◽  
Pool Boiling

scholarly journals Bubble dynamics and heat transfer for pool boiling on hydrophilic, superhydrophobic and biphilic surfaces

2016 ◽  
Vol 745 ◽  
pp. 032132 ◽  
Author(s):  
E. Teodori ◽  
T. Palma ◽  
T. Valente ◽  
A.S. Moita ◽  
A.L.N. Moreira
Keyword(s):  
Heat Transfer ◽  
Bubble Dynamics ◽  
Pool Boiling

Self-Propelled Sliding Bubble Motion Induced by Surface Microstructure in Pool Boiling of a Dielectric Fluid Under Microgravity

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Naveenan Thiagarajan ◽  
Sushil H. Bhavnani ◽  
Vinod Narayanan
Keyword(s):  
Vapor Bubble ◽  
Bubble Dynamics ◽  
Heated Surface ◽  
Pool Boiling ◽  
Bubble Nucleation ◽  
Radius Of Curvature ◽  
Dielectric Fluid ◽  
Bubble Motion ◽  
Reduced Gravity ◽  
Modification Technique

This paper reports bubble dynamics observed during pool boiling over microstructures with an asymmetric saw-tooth cross section, under reduced gravity. The periodic saw-toothed ratchets etched on a silicon surface include fabricated vapor bubble nucleation sites only on the shallow slope. Reduced gravity pool boiling experiments were conducted aboard a Boeing 727 aircraft carrying out parabolic maneuvers. The fluid used was FC-72, a highly wetting dielectric fluid used as a coolant for electronics. Under microgravity, it was observed that the bubble diameters were six times larger than in terrestrial gravity. Also, self-propelled sliding bubble motion along the surface of the saw teeth was observed in reduced gravity. The velocity of the sliding bubbles across the saw teeth, following lateral departure from the cavities, was measured to be as high as 27.4 mm/s. A model for the sliding bubble motion is proposed by attributing it to the force due to pressure differences that arise in the liquid film between the vapor bubble and the saw-toothed heated surface. The pressure difference is due to difference in the radius of curvature of the interface between the crest and trough of the saw teeth. The surface modification technique, which resulted in the sliding bubble motion, has the potential to alleviate dry-out caused due to stagnant vapor bubbles over heat sources under microgravity when the buoyancy forces are negligible compared to the surface tension forces.

Bubble Dynamics and Heat Transfer During Pool Boiling on Wettability Patterned Surfaces

2017 ◽  
Vol 39 (7-8) ◽  
pp. 663-671 ◽  
Author(s):  
Zhen Sun ◽  
Xiaodan Chen ◽  
Huihe Qiu
Keyword(s):  
Heat Transfer ◽  
Bubble Dynamics ◽  
Pool Boiling ◽  
Patterned Surfaces

Pore-Scale Simulation on Pool Boiling Heat Transfer and Bubble Dynamics in Open-Cell Metal Foam by Lattice Boltzmann Method

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Jie Qin ◽  
Zhiguo Xu ◽  
Xiaofei Ma
Keyword(s):  
Heat Transfer ◽  
Lattice Boltzmann ◽  
Boiling Heat Transfer ◽  
Bubble Dynamics ◽  
Metal Foam ◽  
Pool Boiling ◽  
Open Cell ◽  
Pool Boiling Heat Transfer ◽  
Boltzmann Method ◽  
Foam Thickness

Abstract Based on the newly developed geometrical model of open-cell metal foam, pool boiling heat transfer in open-cell metal foam, considering thermal responses of foam skeletons, is investigated by the phase-change lattice Boltzmann method (LBM). Pool boiling patterns are obtained at different heat fluxes. The effects of pore density and foam thickness on bubble dynamics and pool boiling heat transfer are revealed. The results show that “bubble entrainment” promotes fluid mixing and bubble sliding inside metal foam. Based on force analysis, the sliding bubble is pinned on the heating surface and cannot lift off completely at high heat flux due to the increasing surface tension force. Pool boiling heat transfer coefficient decreases with increasing pore density and foam thickness due to high bubble escaping resistance.

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