NUMERICAL SIMULATION OF THE CONVECTIVE HEAT EXCHANGE IN THE SEPARATION AIR AND OIL FLOWS IN A STAGGERED BANK OF ROUND TUBES IN A WIDE RANGE OF CHANGE IN THE REYNOLDS NUMBER

An analysis of the convective heat exchange in the separation air and oil fl ows in banks of heated round tubes and their hydraulic losses at Reynolds numbers changing in a wide range from 100 to 400 for the laminar fl ow and from 10³ to 8·10³ for the turbulent flow has been performed. For solving the Navier–Stokes and energy equations, multiblock computational technologies realized in the VP2/3 package and original procedures for correction of the pressure gradient in a fl ow and its mean-mass temperature were used. The Reynolds-averaged Navier–Stokes equations were closed using the Menter shear-stress transfer model modifi ed with account for the curvature of streamlines within the framework of the Leshtsiner–Rody approach with an Isaev–Kharchenko–Usachov constant equal to 0.2. The results of numerical simulation were compared with the corresponding experimental data of A. Zhukaukas. The dependence of the local and integral characteristics of a fl ow of a heat-transfer agent in a staggered bank of round tubes on the properties of this agent was determined.
   
Author:  S. A. Isaev, Yu. V. Zhukova, and D. A. Malyshkin
Keywords:  heat transfer, hydraulic losses, round-tube bank, air, transformer oil, pressure-correction procedure, multiblock computational technologies
Page:  885