Saturated nucleate pool boiling of oxygen under magnetically-enhanced effective gravity*

We investigate the effect of enhancing gravity on saturated nucleate pool boiling of oxygen for effective gravities ($g_{\mathrm{eff}}$) of $1g$, $6g$, and $16g$ ($g=9.8\;\mathrm{m s^{-2}}$) at a saturation pressure of $760\;\mathrm{torr}$ and for heat fluxes of $10\sim 3000\;\mathrm{W m^{-2}}$. The effective gravity on the oxygen is increased by applying a magnetic body force generated by a superconducting solenoid. We measure the heater temperature (expressed as a reduced superheat) as a function of heat flux and fit this data to a piecewise power-law/linear boiling curve. At low heat flux ($\alt 400\;\mathrm{W m^{-2}}$) the superheat is proportional to the cube root of the heat flux. At higher heat fluxes, the superheat is a linear function of the heat flux. The value of the transition heat flux separating these two regions is proportional to $g_{\mathrm{eff}}^{0.25}$, indicating a possible link to the critical heat flux.