Thermal And Visual Observation Of Water And Acetone Oscillating Heat Pipes
Daniel S. Hussey, David L. Jacobson, Hongbin Ma, R. A. Winholtz, Corey Wilson, Corey Borgmeyer
Identical oscillating heat pipes (OHP) charged separately with water and acetone were observed thermally and visually at varying condenser temperatures and heat inputs. Neutron radiography allowed visualization of hydrogen rich liquid water and acetone within the copper OHP. Four identical 6 turn OHPs were constructed; two open loop and two closed loop. One set each of open-loop and closed loop OHPs was charged with acetone and an open and closed loop OHP were charged with water at fill ratios of 50%. The OHPs were instrumented with 24 thermocouples, heated with a strip heater, and cooled with heavy water. Both thermal and visual data were collected simultaneously. The experiments show that at low heat flux and condenser temperature, the acetone OHP performed better than the water OHP. Using neutron radiography, the acetone OHP was seen to have higher fluid velocity than the water OHP. The fluid flow pattern was also more consistent throughout the entire closed loop acetone OHP including full circulation of the fluid. The closed loop water OHP never fully circulates through the turn connecting the two sides. Lastly, neutron radiography shows that the open loop OHPs not only have less fluid motion at the side turns, the interior turns also have reduced fluid motion compared to the closed loop OHPs.
, Duewer, D.
, Ma, H.
, Winholtz, R.
, Wilson, C.
and Borgmeyer, C.
Thermal And Visual Observation Of Water And Acetone Oscillating Heat Pipes, Journal of Heat Transfer-Transactions of the ASME, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905006
(Accessed August 18, 2022)