عنوان المقالة:تاخر الطور على الحمل الحراري الانتقالي في قناه مايكرويه Effect of Dual-Phase-Lag in the Presence of Suction/Injection on Unsteady Free-Convection Micro-Channel Flow between Two Vertical Porous Plates
تاخر الطور على الحمل الحراري الانتقالي في قناه مايكرويه
Abstract
The transient, laminar, fully developed, free convection flow inside an open-ended, vertical, parallel-porousplate,
micro-channel is considered using Dual-Phase-Lag heat conduction model. This study adopted the
approach of the model that combines both continuum and possibility of slip at the boundary. The well known
Laplace transform technique is applied to solve the time dependent governing equations, while the method of
Riemann-sum approximation is employed to invert the Laplace domain to the time domain in order to obtain the
velocity, temperature, skin-friction and rate of heat transfer. The obtained results are described by line graphs. It
has been observed that the phase lags in both heat flux and temperature gradient on the micro-channel thermal
behaviour have significant effect at the early stage of time. And as the temperature phase lag is set greater than
that of heat flux phase lag, higher fluid temperature, velocity as well as the velocity slip at the hot wall are
observed than when it is less than the heat flux phase lag. Increase in suction/injection increases the skin friction
and the Nusselt number at the hot wall of the micro-channel.
الاستاذ الدكتور احمد كاظم حسين | Prof.Dr. Ahmed Kadhim Hussein | 5666