CONVECTIVE HEAT TRANSFER IN A BUBBLE LAMINAR FLOW IN A ROUND-CYLINDER TUBEA. P. Vasil'ev UDC 536.24:621.1 The problem of heat exchange between a two-phase laminar flow in a round-cylinder tube and the isothermal wall of the tube is studied. An exact analytical solution is obtained. Orenburg State University, Orenburg, Russia; email: OVASILIEV@YANDEX.RU. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 4, pp. 73-79, July-August, 2003. Original article submitted June 4, 2002.