Pool Boiling Heat Transfer of Borated (H3BO3) Water on a Nanoporous Surface

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Miguel Amaya ◽  
Sang M. Kwark ◽  
Ajay Gurung ◽  
Seung M. You
Keyword(s):  
Heat Transfer ◽  
Boric Acid ◽  
Acid Deposition ◽  
Boiling Heat Transfer ◽  
Pure Water ◽  
Pool Boiling ◽  
Pressurized Water ◽  
Pool Boiling Heat Transfer ◽  
Borated Water ◽  
Nanoporous Surface

With regard to potential application in pressurized water reactors (PWRs), a nanoporous heated surface was tested in pool boiling of an aqueous solution of boric acid (H3BO3), or borated water (1% volume concentration). The effect of system pressure and surface orientation on pool boiling heat transfer (BHT) was studied. The nanoporous surface consisted of a coating of alumina nanoparticles applied on a 1 cm2 flat copper surface through nanofluid boiling. An uncoated surface in borated water was similarly tested, and due to boric acid deposition, the BHT degraded and the critical heat flux (CHF) enhanced relative to pure water. Also, the possibility of transient pool boiling behavior of borated water was investigated but none was detected. With pressure and orientation variation, the nanoporous surface imposed on borated water showed a trend of further CHF enhancement to the CHF limit produced by the nanoporous surface in pure water. Over the nanoporous surface, the CHF of borated water was increasingly better with decreasing pressure, than that over the plain surface. However, BHT degraded slightly further. Boric acid deposition over the nanoporous surface was believed to be the source of this BHT degradation, but played no apparent role in the further CHF enhancement.

Pool Boiling Heat Transfer of Borated (H3BO3) Water on a Nanoporous Surface

2012 ◽  
Author(s):  
Miguel Amaya ◽  
Sang M. Kwark ◽  
Ajay Gurung ◽  
Seung M. You
Keyword(s):  
Heat Transfer ◽  
Boric Acid ◽  
Acid Deposition ◽  
Boiling Heat Transfer ◽  
Pure Water ◽  
Pool Boiling ◽  
Pressurized Water ◽  
Pool Boiling Heat Transfer ◽  
Borated Water ◽  
Nanoporous Surface

With regard to potential application in pressurized water reactors (PWRs), a nanoporous heated surface was tested in pool boiling of an aqueous solution of boric acid (H3BO3), or borated water (1% volume concentration). The effect of different system pressures and different surface orientations on pool boiling heat transfer was studied. The nanoporous surface consisted of a coating of alumina nanoparticles applied on a 1 cm2 flat copper surface through nanofluid boiling. An uncoated surface in borated water was similarly tested, and due to boric acid deposition, the boiling heat transfer (BHT) degraded and the critical heat flux (CHF) enhanced relative to pure water. Also, the possibility of transient pool boiling behavior of borated water was investigated but none was detected. For all pressures and orientations, the nanoporous surface further enhanced the CHF of borated water to the CHF produced by the nanoporous surface in pure water. Over the nanoporous surface, the CHF of borated water was increasingly better with decreasing pressure, than that over the plain surface. However, BHT degraded slightly further. Boric acid deposition over the nanoporous surface was believed to be the source of this BHT degradation, but played no apparent role in the further CHF enhancement.

scholarly journals EFFECT OF SOLUBLE ADDITIVES, BORIC ACID (H3BO3) AND SALT (NaCl), IN POOL BOILING HEAT TRANSFER

2011 ◽  
Vol 43 (3) ◽  
pp. 195-204 ◽  
Author(s):  
Sang-M. Kwark ◽  
Miguel Amaya ◽  
Hye-Jin Moon ◽  
Seung-M. You
Keyword(s):  
Heat Transfer ◽  
Boric Acid ◽  
Boiling Heat Transfer ◽  
Pool Boiling ◽  
Pool Boiling Heat Transfer

Investigation on the Effect of Type and Size of Nanoparticles and Surfactant on Pool Boiling Heat Transfer of Nanofluids

2015 ◽  
Vol 138 (3) ◽  
Author(s):  
Tofigh Sayahi ◽  
Masoud Bahrami
Keyword(s):  
Heat Transfer ◽  
Zinc Oxide ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Boiling Heat Transfer ◽  
Pure Water ◽  
Pool Boiling ◽  
Heat Removal ◽  
Pool Boiling Heat Transfer ◽  
Boiling Heat Transfer Coefficient

In our efforts to improve the pool boiling heat transfer of water, three sets of experiments are carried out to investigate the best coolant for heat removal among alumina, silica, and zinc oxide as nanoparticles and water as base fluid: (a) pool boiling heat transfer of γ-alumina/water nanofluid with and without surfactant in both distilled water and treated water as base fluids, (b) pool boiling heat transfer of silica/water nanofluid with two different nanoparticle sizes, and (c) pool boiling heat transfer of zinc oxide/water nanofluid with surfactant. In all the above experiments, the effect of heater surface on boiling heat transfer coefficient has been investigated by repeating the experiment using pure water on the coated surface before cleaning it. Moreover, two effective thermophysical properties of fluids, dynamic viscosity and surface tension, are measured to explain the boiling behavior of the nanofluids. The experimental results indicate that (a) the presence of γ-alumina in the base fluid enhances the pool boiling heat transfer coefficient, but sodium dodecyl sulphate (SDS) as surfactant deteriorates the performance of pool boiling heat transfer of γ-alumina/water nanofluid and (b) silica nanoparticles reduce the boiling performance of pure water. Moreover, the larger particle size of silica nanoparticles shows less reduction in heat transfer coefficient, (c) zinc oxide/water nanofluid is the best coolant among all the above-mentioned nanoparticles for heat removal.

scholarly journals Pool boiling heat transfer of a copper microporous coating in borated water

2020 ◽  
Vol 52 (9) ◽  
pp. 1939-1944
Author(s):  
Seongchul Jun ◽  
Juan C. Godinez ◽  
Seung M. You ◽  
Hwan Yeol Kim
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Pool Boiling ◽  
Pool Boiling Heat Transfer ◽  
Microporous Coating ◽  
Borated Water

Nanocoating characterization in pool boiling heat transfer of pure water

2010 ◽  
Vol 53 (21-22) ◽  
pp. 4579-4587 ◽  
Author(s):  
Sang M. Kwark ◽  
Gilberto Moreno ◽  
Ratan Kumar ◽  
Hyejin Moon ◽  
Seung M. You
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Pure Water ◽  
Pool Boiling ◽  
Pool Boiling Heat Transfer

Numerical investigation of surface roughness effect on pool boiling heat transfer of Al2O3/water nanofluid

2021 ◽  
pp. 095440622110157
Author(s):  
Fatemeh Mousavi ◽  
Pouyan Adibi ◽  
Ehsan Abedini
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Boiling Heat Transfer ◽  
Pure Water ◽  
Pool Boiling ◽  
Initial Surface ◽  
Pool Boiling Heat Transfer ◽  
Boiling Heat Transfer Coefficient

This study examined the effect of surface roughness on the pool boiling heat transfer coefficient of pure water and water-alumina nanofluid with 0.1% and 0.01% volume concentration using computational fluid dynamics on the surface of a stainless-steel cylinder. The effect of nanoparticles was checked by averaging the thermophysical properties in the equations of the flow field with boiling. Simulations were performed for initial surface roughnesses from 0.1 to 0.8 µm. Furthermore, the presence of nanoparticles would make their deposition on the heated surface and change the surface properties. Thus, once again simulations were performed for roughness with the same values but because of the deposition of nanoparticles. In doing so, two separate equations were used for the nucleation site density parameter. Ultimately, the results obtained from both types of roughness were compared. The results indicated that with an increase in the roughness, the boiling heat transfer coefficient increased. Further, at the same roughness, the boiling heat transfer rate of the deposited surface decreased for nanofluid of 0.01% vol and increased for nanofluid of 0.1% vol compared to the non-deposited surface. For pure water at 0.8 µm roughness, the sediment improved heat transfer but it reduced heat transfer for 0.4 µm and lower roughness.

Nucleate Pool Boiling Heat Transfer in Microgravity

1998 ◽  
Vol 29 (1-3) ◽  
pp. 196-207
Author(s):  
Haruhiko Ohta ◽  
Koichi Inoue ◽  
Suguru Yoshida ◽  
Tomoji S. Morita
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Pool Boiling ◽  
Nucleate Pool Boiling ◽  
Pool Boiling Heat Transfer

SOME PROBLEMES ON POOL BOILING HEAT TRANSFER

1970 ◽  
Author(s):  
V. I. Subbotin ◽  
D. N. Sorokin ◽  
A.A, Tsiganok
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Pool Boiling ◽  
Pool Boiling Heat Transfer
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