Ucotherm, heat transfer medium, Ulinskas, R, Ulrych, G, Undecane: 1-Undecene: Unequal baffle spacing, correction factor for, UNIFAC method, for estimation of thermodynamic properties of mixtures, Uniform heat flux: Uniform wall temperature, combined forced and free convection in channels with: United Kingdom, mechanical design of heat exchangers in: Universal laws, for turbulent boundary layers, Universal velocity defect law, Universal velocity profile, Unsteady flows: Upward-facing surface, free convective heat transfer from, US, mechanical design of heat exchangers in: U-tube bundles, for shell-and-tube heat exchangers Utility selection, in heat exchanger network analysis by the pinch method,