Experimental and Numerical Study of Nucleate Pool Boiling Heat Transfer and Bubble Dynamics in Saline Solution

Abstract A visual pool boiling experimental device based on ITO coating layer heater and high-speed shooting technology was established for studying the bubble behavior and heat transfer characteristics of saline solution, which is of great significance for ensuring heat transfer safety in nuclear power plants, steam injection boilers and seawater desalination. Volume of fluid method was applied to simulate numerically the liquid–vapor phase change by adding source terms in the continuity equation and energy equation. The predictions of the model are quantitatively verified against the experimental data. It can be found based on the experimental data that the pool boiling heat transfer coefficient is enhanced as the salt concentration increases. Visualization studies and numerical data have shown that the presence and precipitation of salt leads to a decrease in the detachment diameter and growth time of the bubble and an increase in the frequency of detachment, thereby increasing the pool boiling heat transfer coefficient.

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Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2015.06.013 ◽

2015 ◽

Vol 89 ◽

pp. 1297-1315 ◽

Cited By ~ 44

Author(s):

Suraj Joottu Thiagarajan ◽

Ronggui Yang ◽

Charles King ◽

Sreekant Narumanchi

Keyword(s):

Heat Transfer ◽

Boiling Heat Transfer ◽

Bubble Dynamics ◽

Pool Boiling ◽

Nucleate Pool Boiling ◽

Copper Surfaces ◽

Pool Boiling Heat Transfer

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Experimental Study of Effect of Nucleation Site Size on Bubble Dynamics during Nucleate Pool Boiling Heat Transfer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.592-594.1596 ◽

2014 ◽

Vol 592-594 ◽

pp. 1596-1600 ◽

Cited By ~ 3

Author(s):

Abdul Najim ◽

Anil R. Aacharya

Keyword(s):

Heat Transfer ◽

Boiling Heat Transfer ◽

Bubble Dynamics ◽

Bubble Diameter ◽

Pool Boiling ◽

Growth Period ◽

Nucleation Site ◽

Hypodermic Needle ◽

Nucleate Pool Boiling ◽

Pool Boiling Heat Transfer

In this paper, effect of nucleation site size on bubble dynamics during nucleate pool boiling heat transfer in saturated water is studied experimentally. Single bubble was generated using right angle tip of a hypodermic needle as a nucleation site. The hypodermic needles were used of inner diameters 0.413mm, 0.514mm, and 0.603 mm with a constant depth of 25mm. The bubble dynamics was studied using SONY Cyber-shot DSC-H100 camera operating at 30 frames per second at atmospheric pressure and at a wall superheat of 5K. The results show that, bubble diameter, bubble height and bubble volume increases with increase in diameter of nucleation site. The bubble growth period is found to be dependent on nucleation site size, and it decreases with increase in diameter of nucleation site. This happens because as volume of vapor bubble increases, buoyancy force starts dominates the capillary force and bubble detaches earlier. Effect of nucleation site size on bubble departure diameter and bubble release frequency is also discussed.

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