RT Journal Article
ID 32b7be8b7fdd359c
A1 Makarevicius, Vytautas Vincentas
T1 Self-Similarity of Differential Equations and Heat Transfer Patterns of a Turbulent Near-Wall Layer
JF Heat Transfer Research
JO HTR
YR 2009
FD 2009-06-09
VO 40
IS 5
SP 485
OP 504
K1 heat transfer; differential equations; self-similarity; quadratures; turbulent boundary layer; chemical energy; kinetic energy
AB After looking at the works performed it becomes obvious that one of the most significant things is recast of a turbulent near-wall layer into locally self-similar one (depending on one coordinate). To solve this task, a number of steps were undertaken, such as determination of a new generalized coordinate, selection of constants and their determination. It should be noted that such recast of near-wall layer equations was carried out for the first time. The recast of equations of this type into locally self-similar ones enables one to ensure high accuracy of the iteration solution, however, powerful means are required — up-to-date computers and software. Such means had not been available previously, thus iteration solutions of quadratures were not performed. Application of the concurrent iteration solution method together with total solution of differential equations may be used with the objective of higher accuracy. Another important task is the determination of boundary heat transfer patterns in cases of variable physical properties. These patterns enable one to choose generalized heat transfer expressions. It was revealed that at high flow temperature turbulence and heat transfer decrease the velocity and temperature profiles change. This phenomenon has a practical value. At high flow temperatures there is no need to install turbulizers for intensification of heat transfer processes since no positive results will be obtained. The latter pattern comprises discovery elements.
PB Begell House
LK http://dl.begellhouse.com/journals/46784ef93dddff27,220cf75a53c0e0c4,32b7be8b7fdd359c.html