The two phase boundary layer in laminar film condensation

The Control of Condensation Heat Transfer Rates Using an Electromagnetic Field

“…The equations describing the condensation of a conducting fluid in the presence of an electromagnetic field are identical to the equations for ordinary condensation [12], [13], to which are added terms appropriate to the electromagnetic effects. If the electromagnetic force is denoted by F, the conservation equations become …”

“…But, at y = 6 (12) where M is the mass rate of condensation per unit area. From an overall mass balance on the condensate film, M is (13) Substituting relations (l2) and (l3) into equation (ll), with some rearrangement, yields the final form of the integral energy balance.…”

Local nonsimilarity method for the two-phase boundary layer in mixed convection laminar film condensation

“…Either the finite difference method [11,12] or the local nonsimilarity method [13] can be used to solve the two-phase boundary layer equations for mixed convection laminar condensation. However, none of these previous studies [11][12][13] has been able to demonstrate in a rigorous way that their solutions at the two limits of mixed convection coincide with the known solutions given by Koh on either free convection [9] or forced convection [10]. This is a nontrivial problem to investigate, because only if the limit solutions are correct can a high level of confidence in the solutions in between be attained.…”

“…The two-phase boundary layer formulation was introduced into studies of free convection film condensation by Sparrow and Gregg [8] and Koh et al [9]. Koh [10] further applied the boundary layer formulation to study forced convection film condensation.…”

Condensation Heat Transfer on Geometrically Enhanced Horizontal Tube: A Review

“…Many theoretical investigations have since been carried out including factors neglected by Nusselt [3] such as convection in condensate, shear stress and inertia (for instance, Sparrow and Gregg [4], Koh et al [5] and Chen [6,7]). The inclusion of these parameters made little practical difference to the results of Nusselt [3].…”