Research output: Contribution to journal › Article › peer-review
Features of vapor bubbles evolution at liquid boiling at subatmospheric pressures. / Serdyukov, V. S.; Malakhov, I. P.; Surtaev, A. S.
In: Thermophysics and Aeromechanics, Vol. 26, No. 4, 01.07.2019, p. 623-626.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Features of vapor bubbles evolution at liquid boiling at subatmospheric pressures
AU - Serdyukov, V. S.
AU - Malakhov, I. P.
AU - Surtaev, A. S.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - The article presents the results of an experimental study of the dynamics of vaporization at water boiling at subatmospheric pressures up to 8.8 kPa. The usage of a transparent heater, high-speed video and IR thermography allowed analyzing the effect of pressure on the dynamics of vapor bubbles, the evolution of dry spots as well as the surface superheating corresponding to the onset of boiling. It is shown that the pressure reduction at a given heat flux density leads to a significant increase in the Jacob number at the activation of the nucleation site and the growth rate of vapor bubbles. It has been found that the curve of dry spots growth rate has a nonlinear dependence on the pressure in the range of 8.8-103 kPa. The minimum value of the growth rate of dry spots is observed at a pressure of 42 kPa.
AB - The article presents the results of an experimental study of the dynamics of vaporization at water boiling at subatmospheric pressures up to 8.8 kPa. The usage of a transparent heater, high-speed video and IR thermography allowed analyzing the effect of pressure on the dynamics of vapor bubbles, the evolution of dry spots as well as the surface superheating corresponding to the onset of boiling. It is shown that the pressure reduction at a given heat flux density leads to a significant increase in the Jacob number at the activation of the nucleation site and the growth rate of vapor bubbles. It has been found that the curve of dry spots growth rate has a nonlinear dependence on the pressure in the range of 8.8-103 kPa. The minimum value of the growth rate of dry spots is observed at a pressure of 42 kPa.
KW - boiling
KW - dry spots
KW - high-speed visualization
KW - IR-thermography
KW - sub-atmospheric pressure
KW - vapor bubbles evolution
UR - http://www.scopus.com/inward/record.url?scp=85075509816&partnerID=8YFLogxK
U2 - 10.1134/S0869864319040140
DO - 10.1134/S0869864319040140
M3 - Article
AN - SCOPUS:85075509816
VL - 26
SP - 623
EP - 626
JO - Thermophysics and Aeromechanics
JF - Thermophysics and Aeromechanics
SN - 0869-8643
IS - 4
ER -
ID: 22406957