Heat Flux Density Evaluation in the Region of Contact Line of Drop on a Sapphire Surface Using Infrared Thermography Measurements

2021 ◽  
Vol 33 (4) ◽  
Author(s):  
A. L. Karchevsky ◽  
V. V. Cheverda ◽  
I. V. Marchuk ◽  
T. G. Gigola ◽  
V. S. Sulyaeva ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Infrared Thermography ◽  
Contact Line ◽  
Heat Flux Density ◽  
Sapphire Surface ◽  
Density Evaluation

scholarly journals Heat Flux at the Surface of Metal Foil Heater under Evaporating Sessile Droplets

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Igor Marchuk ◽  
Andrey Karchevsky ◽  
Anton Surtaev ◽  
Oleg Kabov
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Contact Line ◽  
Heat Flux Density ◽  
Metal Foil ◽  
Foil Surface ◽  
Ir Camera ◽  
Maximum Heat ◽  
Average Heat ◽  
Line Region

Evaporating water drops on a horizontal heated substrate were investigated experimentally. The heater was made of a constantan foil with the thickness of 25 μm and size of 42 × 35 mm2. The temperature of the bottom foil surface was measured by the infrared (IR) camera. To determine the heat flux density during evaporation of liquid near the contact line, the Cauchy problem for the heat equation was solved using the temperature data. The maximum heat flux density is obtained in the contact line region and exceeds the average heat flux density from the entire foil surface by the factor of 5–7. The average heat flux density in the region wetted by the drop exceeds the average heat flux density from the entire foil surface by the factor of 3–5. This fact is explained by the heat influx from the foil periphery to the drop due to the relatively high heat conductivity coefficient of the foil material and high evaporation rate in the contact line region. Heat flux density profiles for pairs of sessile droplets are also investigated.

Heat flux density in the region of droplet contact line on a horizontal surface of a thin heated foil

2017 ◽  
Vol 24 (5) ◽  
pp. 803-806 ◽  
Author(s):  
V. V. Cheverda ◽  
A. L. Karchevsky ◽  
I. V. Marchuk ◽  
O. A. Kabov
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Contact Line ◽  
Heat Flux Density ◽  
Horizontal Surface

HEAT FLUX DENSITY MEASURMENTS IN THE CONTACT LINE OF THE HEATED SESSILE DROPLET/FALLING DOWN LIQUID RIVULET

2018 ◽  
Author(s):  
Vechaslav V. Cheverda ◽  
T. G. Ponomarenko ◽  
Andrey L. Karchevsky ◽  
Oleg A. Kabov
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Contact Line ◽  
Heat Flux Density ◽  
Sessile Droplet

THERMAL BEHAVIOR AND IGNITION OF HIGH-ENERGY MATERIALS CONTAINING B, ALB2, AND TIB2

2020 ◽  
Author(s):  
A. G. Korotkikh ◽  
◽  
V. A. Arkhipov ◽  
I. V. Sorokin ◽  
E. A. Selikhova ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermal Behavior ◽  
Flux Density ◽  
Ignition Delay ◽  
Delay Time ◽  
Heat Flux Density ◽  
Ignition Delay Time ◽  
High Energy ◽  
Energy Materials ◽  
High Energy Materials

The paper presents the results of ignition and thermal behavior for samples of high-energy materials (HEM) based on ammonium perchlorate (AP) and ammonium nitrate (AN), active binder and powders of Al, B, AlB2, and TiB2. A CO2 laser with a heat flux density range of 90-200 W/cm2 was used for studies of ignition. The activation energy and characteristics of ignition for the HEM samples were determined. Also, the ignition delay time and the surface temperature of the reaction layer during the heating and ignition for the HEM samples were determined. It was found that the complete replacement of micron-sized aluminum powder by amorphous boron in a HEM sample leads to a considerable decrease in the ignition delay time by a factor of 2.2-2.8 at the same heat flux density due to high chemical activity and the difference in the oxidation mechanisms of boron particles. The use of aluminum diboride in a HEM sample allows one to reduce the ignition delay time of a HEM sample by a factor of 1.7-2.2. The quasi-stationary ignition temperature is the same for the AlB2-based and AlB12-based HEM samples.

A thermoelectric device for ophthalmic heat flux density measurements: results of piloting in healthy individuals

2019 ◽  
Vol 80 (3) ◽  
pp. 45-51
Author(s):  
L. Anatychuk ◽  
N. Pasyechnikova ◽  
V. Naumenko ◽  
O. Zadorozhnyy ◽  
R. Kobylianskyi ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Heat Flux Density ◽  
Thermoelectric Device ◽  
Healthy Individuals ◽  
Density Measurements

Surface renewal analysis for sensible and latent heat flux density

1996 ◽  
Vol 77 (3-4) ◽  
pp. 249-266 ◽  
Author(s):  
R. L. Snyder ◽  
D. Spano ◽  
K. T. Pawu
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Latent Heat ◽  
Latent Heat Flux ◽  
Heat Flux Density ◽  
Surface Renewal ◽  
Latent Heat Flux Density
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