Vapor Bubble Dynamics in Upward Subcooled Flow Boiling During Void Evolution
Bubble generation was observed using a high-speed
camera in subcooled flow boiling at low void fraction. Constant heat
flux was applied on one side of an upward rectangular channel to
make heated test channel. Water as a working fluid from high
subcooling to near saturation temperature was injected step by step to
investigate bubble behavior during void development. Experiments
were performed in two different pressures condition close to 2bar and
4bar. It was observed that in high subcooling when boiling was
commenced, bubble after nucleation departed its origin and slid
beside heated surface. In an observation window mean release
frequency of bubble fb,mean, nucleation site Ns and mean bubble
volume Vb,mean in each step of experiments were measured to
investigate wall vaporization rate. It was found that in proximity of
PNVG vaporization rate was increased significantly in compare with
condensation rate which remained in low value.
[1] S. C. Lee and S. G. Bankoff, Prediction of the onset of flow instability
in transient subcooled flow boiling, Nuclear Engineering and Design,
Vol. 139, 1993, pp. 149-159
[2] P. G. Kroeger, N. Zuber, An analysis of the effects of various parameters
on the average void fractions in subcooled boiling, International Journal
of Heat and Mass Transfer, Vol. 11, 1968, pp. 211-233.
[3] S. C. Lee and S. G. Bankoff, A Comparison of Predictive Models for the
Onset of Significant Void at Low Pressures in Forced-Convection
Subcooled Boiling, KSME International Journal, Vol. 12, No. 3, 1998,
pp. 504-513
[4] S. Levy, Forced convection subcooled boiling prediction of vapor
volumetric fraction, International Journal of Heat and Mass Transfer 10,
1967, pp. 951-965.
[5] P. Saha, N. Zuber, Point of net vapor generation and vapor void fraction
in subcooled boiling, Proceedings of the 5th Heat Transfer Conference,
Tokyo, Japan, 1974, pp. 175-179.
[6] Bowring, R. W., 1962, Physical Model Based on Bubble Detachment
and Calculation of Steam Voidage in the Subcooled Region of a Heated
Channel, HPR-10, Institutt for Atomenergi, Halden, Norway.
[7] J.T. Rogers, M. Salcudean, Z. Abdullah, D. McLeod, D. Poirier, The
onset of significant void in up-flow boiling of water at low pressure and
velocities, International Journal of Heat and Mass Transfer 30, 1987, pp.
2247-2260.
[8] J.G. Collier, J.R. Thome, Convective Boiling and Condensation, third
ed., Oxford University Press, Oxford, 1994. pp. 325-374.
[9] G. R. Warrier & V. K. Dhir , Heat Transfer and Wall Heat Flux
Partitioning During Subcooled Flow Nucleate BoilingÔÇöA Review,
Journal of Heat Transfer 128, 2006, pp. 1243-1256.
[10] R. Ahmadi, T. Ueno, T. Okawa, Bubble dynamics at boiling incipience
in subcooled upward flow boiling, International Journal of Heat and
Mass Transfer 55 (1-3), 2012, pp. 488-497.
[11] Dix, G. E., Vapor Void Fraction For Forced Convection with Subcooled
Boiling at Low Flow Rates, 1971, Ph.D. thesis, University of California,
Berkeley.
[12] E.L. Bibeau, M. Salcudean, A study of bubble ebullition in forcedconvective
subcooled nucleate boiling at low pressures, International
Journal of Heat and Mass Transfer 37, 1994, pp. 2245-2259.
[13] T. Okawa, T. Ishida, I. Kataoka, M. Mori, Bubble rise characteristics
after the departure from a nucleation site in vertical upflow boiling of
subcooled water, Nuclear Engineering and Design 235, 2005, pp. 1149-
1161.
[14] O. Zeitoun, M. Shoukri, Bubble behavior and mean diameter in
subcooled flow boiling, Transactions of ASME, Journal of Heat
Transfer 118, 1996, pp. 110-116
[1] S. C. Lee and S. G. Bankoff, Prediction of the onset of flow instability
in transient subcooled flow boiling, Nuclear Engineering and Design,
Vol. 139, 1993, pp. 149-159
[2] P. G. Kroeger, N. Zuber, An analysis of the effects of various parameters
on the average void fractions in subcooled boiling, International Journal
of Heat and Mass Transfer, Vol. 11, 1968, pp. 211-233.
[3] S. C. Lee and S. G. Bankoff, A Comparison of Predictive Models for the
Onset of Significant Void at Low Pressures in Forced-Convection
Subcooled Boiling, KSME International Journal, Vol. 12, No. 3, 1998,
pp. 504-513
[4] S. Levy, Forced convection subcooled boiling prediction of vapor
volumetric fraction, International Journal of Heat and Mass Transfer 10,
1967, pp. 951-965.
[5] P. Saha, N. Zuber, Point of net vapor generation and vapor void fraction
in subcooled boiling, Proceedings of the 5th Heat Transfer Conference,
Tokyo, Japan, 1974, pp. 175-179.
[6] Bowring, R. W., 1962, Physical Model Based on Bubble Detachment
and Calculation of Steam Voidage in the Subcooled Region of a Heated
Channel, HPR-10, Institutt for Atomenergi, Halden, Norway.
[7] J.T. Rogers, M. Salcudean, Z. Abdullah, D. McLeod, D. Poirier, The
onset of significant void in up-flow boiling of water at low pressure and
velocities, International Journal of Heat and Mass Transfer 30, 1987, pp.
2247-2260.
[8] J.G. Collier, J.R. Thome, Convective Boiling and Condensation, third
ed., Oxford University Press, Oxford, 1994. pp. 325-374.
[9] G. R. Warrier & V. K. Dhir , Heat Transfer and Wall Heat Flux
Partitioning During Subcooled Flow Nucleate BoilingÔÇöA Review,
Journal of Heat Transfer 128, 2006, pp. 1243-1256.
[10] R. Ahmadi, T. Ueno, T. Okawa, Bubble dynamics at boiling incipience
in subcooled upward flow boiling, International Journal of Heat and
Mass Transfer 55 (1-3), 2012, pp. 488-497.
[11] Dix, G. E., Vapor Void Fraction For Forced Convection with Subcooled
Boiling at Low Flow Rates, 1971, Ph.D. thesis, University of California,
Berkeley.
[12] E.L. Bibeau, M. Salcudean, A study of bubble ebullition in forcedconvective
subcooled nucleate boiling at low pressures, International
Journal of Heat and Mass Transfer 37, 1994, pp. 2245-2259.
[13] T. Okawa, T. Ishida, I. Kataoka, M. Mori, Bubble rise characteristics
after the departure from a nucleation site in vertical upflow boiling of
subcooled water, Nuclear Engineering and Design 235, 2005, pp. 1149-
1161.
[14] O. Zeitoun, M. Shoukri, Bubble behavior and mean diameter in
subcooled flow boiling, Transactions of ASME, Journal of Heat
Transfer 118, 1996, pp. 110-116
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:61519", author = "Rouhollah Ahmadi and Tatsuya Ueno and Tomio Okawa", title = "Vapor Bubble Dynamics in Upward Subcooled Flow Boiling During Void Evolution", abstract = "Bubble generation was observed using a high-speed
camera in subcooled flow boiling at low void fraction. Constant heat
flux was applied on one side of an upward rectangular channel to
make heated test channel. Water as a working fluid from high
subcooling to near saturation temperature was injected step by step to
investigate bubble behavior during void development. Experiments
were performed in two different pressures condition close to 2bar and
4bar. It was observed that in high subcooling when boiling was
commenced, bubble after nucleation departed its origin and slid
beside heated surface. In an observation window mean release
frequency of bubble fb,mean, nucleation site Ns and mean bubble
volume Vb,mean in each step of experiments were measured to
investigate wall vaporization rate. It was found that in proximity of
PNVG vaporization rate was increased significantly in compare with
condensation rate which remained in low value.", keywords = "Subcooled flow boiling, Bubble dynamics, Void
fraction, Sliding bubble.", volume = "6", number = "9", pages = "1994-8", }