Heat transfer in nucleate pool boiling of aqueous SDS and triton X-100 solutions

Abstract

Variation in degree of surface wettability is presented through the application of Cooper’s correlative approach (h ∝ M−0.5qw″0.67) for computing enhancement (ϕ) in nucleate pool boiling of aqueous solutions of SDS and Triton X-100 and its presentation with Marangoni parameter (χ) that represents the dynamic convection effects due to surface tension gradients. Dynamic spreading coefficient defined as σdynNa, which relates spreading and wetting characteristics with the active nucleation site density on the heated surface and bubble evolution process, represents cavity filling and activation process and eliminates the concentration dependence of nucleate pool boiling heat transfer in boiling of aqueous surfactant solutions. Using the dynamic spreading coefficient (σdynNa = 0.09qw″0.71), correlation predictions within ±15% for both SDS and Triton X-100 solutions for low heat flux boiling condition (qw″ ≤ 100 kW/m2) characterised primarily by isolated bubble regime are presented.