Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Experimental study of bubble behaviors and CHF on printed circuit board (PCB) in saturated pool water at various inclination angles

  • Tanjung, Elvira F. (School of Mechanical Engineering, Kyungpook National University) ;
  • Alunda, Bernard O. (School of Mechanical Engineering, Kyungpook National University) ;
  • Lee, Yong Joong (School of Mechanical Engineering, Kyungpook National University) ;
  • Jo, Daeseong (School of Mechanical Engineering, Kyungpook National University)
  • Received : 2017.12.01
  • Accepted : 2018.06.11
  • Published : 2018.10.25
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Abstract

Experiments were performed to investigate bubble behaviors and pool boiling Critical Heat Flux (CHF) on a thin flat rectangular copper heater fabricated on Printed Circuit Board (PCB), at various inclination angles. The surface inclination angles were $0^{\circ}$, $45^{\circ}$, $90^{\circ}$, $135^{\circ}$, and $180^{\circ}$. Results showed the Onset of Nucleate Boiling (ONB) heat flux increased with increasing heater orientation from $0^{\circ}$ to $90^{\circ}$, while early ONB occurred when the heater faced downwards ($135^{\circ}$ and $180^{\circ}$). The nucleate boiling was observed to be unstable at low heat flux (1-21% of CHF) and changed into typical boiling when the heat flux was above 21% of CHF. The result shows the CHF decreased with increasing heater orientation from $0^{\circ}$ to $180^{\circ}$. In addition, the bubble departure diameter at the heater facing upwards ($0^{\circ}$, $45^{\circ}$, and $90^{\circ}$) was more prominent compared to that of the heater facing downward ($135^{\circ}$). The nucleation site density also observed increased with increasing heat flux. Moreover, the departed bubbles with larger size were observed to require a longer time to re-heat and activate new nucleation sites. These results proved that the ONB, CHF, and bubble dynamics were strongly dependent on the heater surface orientation.

Keywords

References

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