An Experimental Study of Microscopic Explosive Boiling Induced by Pulsed-Laser Irradiation

2002 ◽  
Author(s):  
Xiulan Huai ◽  
Zhaoyi Dong ◽  
Dengying Liu ◽  
G.-X. Wang
Keyword(s):  
Experimental Study ◽  
Heating Rate ◽  
Laser Heating ◽  
High Speed ◽  
Quartz Substrate ◽  
Pulsed Laser ◽  
Bubble Nucleation ◽  
Nucleation Temperature ◽  
Heating Rates ◽  
Explosive Boiling

Microscopic explosive boiling due to rapid heating has found many applications in modern technologies such as thermal ink jet printing, laser cleaning, and laser surgery. It is a nonequilibrium process involving an extremely high liquid superheating. This paper presents an experimental study of such an explosive vaporization process induced by firing a microsecond pulsed laser beam on a thin Pt film deposited on a quartz substrate. The temperature variation of the Pt film is measured by recording the electric resistance of the film during laser heating and subsequent cooling. A high-speed photographic technique is employed to visualize the bubble formation and the explosive evaporation process. Explosive boiling experiments have been carried out in either a pool of acetone liquid or a thin acetone film covering the Pt film. The heating rate achieved ranges from 8.0×106 K/s to 9.0×107 K/s. Violent explosive boiling was observed in the case of a liquid film and the vapor bubbles together with liquid droplets were expelled from the Pt film. While in the case of a liquid pool, only a large cluster of bubbles was formed on the Pt film during laser heating. A close examination of the temperature curves reveals a sudden reduction in the heating rate during laser heating, and an apparent bubble nucleation temperature can be defined. Experimental data show that this apparent bubble nucleation temperature is a strong function of the heating rate. It is close to the equilibrium boiling point at low heating rates while approaches the homogeneous nucleation temperature at high heating rates.

Numerical and Experimental Study on Pulsed-Laser Heating Process of ZnO Films

2007 ◽  
Vol 124-126 ◽  
pp. 311-314
Author(s):  
Toshiyuki Nakamiya ◽  
Sang Moo Park ◽  
Kenji Ebihara ◽  
Tomoaki Ikegami ◽  
Ryoichi Tsuda
Keyword(s):  
Experimental Study ◽  
Laser Heating ◽  
Pulsed Laser ◽  
Zno Films ◽  
Heating Process ◽  
Pulsed Laser Heating

Coupled Effects of Heating Method and Rate on the Measured Nonisothermal Austenization Temperature of Steel SUS420J1 in Heat Treatment

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Hongze Wang ◽  
Yosuke Kawahito ◽  
Yuya Nakashima ◽  
Kunio Shiokawa
Keyword(s):  
Heat Treatment ◽  
Temperature Distribution ◽  
Heating Rate ◽  
Induction Heating ◽  
Laser Heating ◽  
Treatment Method ◽  
Infrared Heating ◽  
Heating Rates ◽  
Element Analysis ◽  
Heating Method

Steel SUS420J1, which is the key material of turbine blade, is generally treated by heat to improve the strength prior to use. And the austenization process at different heating rates would determine the depth and width of heat treatment. In this paper, the austenization temperatures in heat treatment with the heat from induction wire, infrared lamp, and laser are measured, respectively. The effect of heating rate on the austenization temperature has been investigated. The research results show that the measured austenization temperature increases with the heating rate. And this trend is specially enlarged in the heat treatment method with larger gradient of temperature distribution, e.g., laser. The calculated phase transformation threshold shows that negative linear relationship exists between the logarithmic heating rate and the logarithmic austenization threshold for both induction heating and infrared heating, while abnormal relationship exists for laser heating. Thermal finite element analysis (FEA) models are then developed to calculate the temperature distributions in these three heating methods, and the calculated results show that the nonuniform temperature distribution leads to the gap between the measured austenization temperature and that of the material, which also leads to the abnormal variation law of austenization threshold in laser heating. The measured austenization temperature in induction heating method is thought to be the closest to the actual austenization temperature of the material among these three methods. This paper provides a guide for choosing the proper parameters to heat the steel SUS420J1 in hardening.

Observation on rapid transient explosive boiling under pulsed-laser heating*

2003 ◽  
Vol 13 (5) ◽  
pp. 385-390
Author(s):  
Xiulan Huai ◽  
Zhaoyi Dong ◽  
Dengying Liu ◽  
Xing Zhang
Keyword(s):  
Laser Heating ◽  
Pulsed Laser ◽  
Explosive Boiling ◽  
Pulsed Laser Heating

On Measuring Bubble Nucleation Temperature of Water/Methanol Mixtures Using Ink-Jet Printer Technology

2001 ◽  
Author(s):  
C. T. Avedisian ◽  
W. S. Osborne ◽  
F. D. McLeod
Keyword(s):  
Power Input ◽  
Bubble Nucleation ◽  
Methanol Concentration ◽  
Nucleation Temperature ◽  
Instrumentation Amplifier ◽  
Heating Rates ◽  
Heater Element ◽  
Ink Jet ◽  
Evolution Of Resistance ◽  
The Difference

Abstract The bubble nucleation temperature of water/methanol mixtures is measured using the fast transient process of thermal ink-jet printer technology. The heater element is placed in a dynamic bridge circuit coupled with an instrumentation amplifier to measure the change in resistance of the heater as a programmed voltage is applied across the bridge. An inflection point in the evolution of resistance signals bubble nucleation. A separate calibration relates resistance to average heater temperature. The results show that the nucleation temperature increases as the power input to the bridge increases for a given concentration. The heating rates are extremely high, in some cases reaching over a quarter billion degrees per second. As methanol concentration increases, the nucleation temperature decreases. It was difficult to measure the nucleation temperature at high methanol dilution because the difference between liquid and vapor thermal conductivity decreases as methanol concentration increases for a given temperature. The nucleation temperatures are successfully correlated with a generalized corresponding states theory.

scholarly journals Studying of the characteristics of a single bubble under subcooled liquid boiling

2021 ◽  
Vol 2088 (1) ◽  
pp. 012048
Author(s):  
N V Vasil’ev ◽  
Yu A Zeigarnik ◽  
K A Khodakov ◽  
S N Vavilov ◽  
A S Nikishin
Keyword(s):  
Experimental Study ◽  
Laser Heating ◽  
High Speed ◽  
Heat Removal ◽  
Frame Rate ◽  
Vapor Bubbles ◽  
Heat Conductance ◽  
Subcooled Liquid ◽  
High Speed Video ◽  
Surrounding Liquid

Abstract An experimental study of the characteristics of single (solitary) bubbles obtained by means of focused laser heating of the surface during the boiling of two subcooled liquids with significantly different properties: water and refrigerant R113 has been carried out. To obtain the most complete detailed information, the technique of synchronized high-speed video filming of the process in two mutually perpendicular planes with a frame rate of up to 150 kHz was used. It is shown that during the boiling of a subcooled liquid, the main mechanism of heat removal from the bubble dome into the surrounding liquid is an unsteady heat conductance. Differences in the behavior of solitary vapor bubbles in the case of boiling of two liquids (water and refrigerant R113) are shown.

Numerical and Experimental Study on Pulsed-Laser Heating Process of ZnO Films

2007 ◽  
pp. 311-314
Author(s):  
Toshiyuki Nakamiya ◽  
Sang Moo Park ◽  
Kenji Ebihara ◽  
Tomoaki Ikegami ◽  
Ryoichi Tsuda
Keyword(s):  
Experimental Study ◽  
Laser Heating ◽  
Pulsed Laser ◽  
Zno Films ◽  
Heating Process ◽  
Pulsed Laser Heating

scholarly journals Effect of the Hybrid Hydrophobic-Hydrophilic Nanostructured Surface on Explosive Boiling

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 212
Author(s):  
Ming-Jun Liao ◽  
Li-Qiang Duan
Keyword(s):  
Liquid Film ◽  
Coating Thickness ◽  
Bubble Nucleation ◽  
Onset Temperature ◽  
Dynamics Simulation ◽  
Hydrophilic Surface ◽  
Pillar Width ◽  
Nanostructured Surface ◽  
Explosive Boiling ◽  
Hydrophobic Coating

The influence of different wettability on explosive boiling exhibits a significant distinction, where the hydrophobic surface is beneficial for bubble nucleation and the hydrophilic surface enhances the critical heat flux. Therefore, to receive a more suitable surface for the explosive boiling, in this paper a hybrid hydrophobic–hydrophilic nanostructured surface was built by the method of molecular dynamics simulation. The onset temperatures of explosive boiling with various coating thickness, pillar width, and film thicknesses were investigated. The simulation results show that the hybrid nanostructure can decrease the onset temperature compared to the pure hydrophilic surface. It is attributed to the effect of hydrophobic coating, which promotes the formation of bubbles and causes a quicker liquid film break. Furthermore, with the increase of the hydrophobic coating thickness, the onset temperature of explosive boiling decreases. This is because the process of heat transfer between the liquid film and the hybrid nanostructured surface is inevitably enhanced. In addition, the onset temperature of explosive boiling on the hybrid wetting surface decreases with the increase of pillar width and liquid film thickness.

Experimental study on laminated glass responses of high-speed trains subject to windblown sand particles loading

2021 ◽  
Vol 300 ◽  
pp. 124332
Author(s):  
Gongxun Deng ◽  
Wen Ma ◽  
Yong Peng ◽  
Shiming Wang ◽  
Song Yao ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Laminated Glass ◽  
Windblown Sand ◽  
High Speed Trains ◽  
Sand Particles
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