_{1}

In this paper, a bank of tubes containing a flowing fluid which is immersed in a cross flow second medium of fluid with different temperature has been studied numerically using computational fluid dynamics. Laminar steady flow with a low Reynolds number has been studied in this work. Inlet mass flow rate and the bulk temperature are known and numerical method has been implemented to study the convective heat transfer to investigate the temperature and flow fields. Effects of different inlet bulk temperatures and mass flow rates have been investigated on temperature and pressure variations.

Periodic heat flows have broad industrial and engineering applications in steam generation in a boiler, condenser or air cooling in the coil of an air conditioner. Forced convection was broadly employed in different kinds of heat exchanger, and in many other applications in which the convective heat transfer has been studied and discussed. Theoretically calculation of heat transfer in a fully developed laminar flow in smooth pipe with uniform heat flux at the wall showed that the Nusselt number was constant [

boundary of the periodic module. The temperature of the tube wall (T_{wall}) is 400 K and the bulk temperature of the cross flow water (T_{bulk}) is 300 K. The physical water properties are also mentioned in

and mass flow rate of 0.05 kg/s. As shown in the figure, temperature has its maximum value as the initial surface temperature of each tube is 400 K which more than the inlet bulk temperature, 300 K. As the inlet flow passes over the tube the temperature of the front tubes side decreases to around 360 K. There is a pass between the tubes which has its lowest temperature value around 270 K. As can be seen the value of temperature behind the tubes reduces to 360 K.

shown in the figure, the initial surface temperature of each tube is 400 K which less than the inlet bulk temperature, 700 K. As the inlet flow passes over the tube the temperature of the front tubes side increases to around 620 K. There is a pass between the tubes which has its highest temperature value around 760 K. As can be seen the value of temperature behind the tubes increases to 550 K.

280 K and thereafter in increases sharply to the surface temperature of the tube, 400 K. At location x = 0.02 m, the temperature decreases from 320 K to around 280 and then increases to about 360 K and slightly reduces to 350 K. At location x = 0.03 m the temperature dramatically drops from tube surface temperature of 400 K to around 280 K and then increases to 340 K.

x = 0.02 m, the temperature increases from 480 K to almost 520 and then decreases to about 440 K and stays constant around this temperature. At location x = 0.03 m the temperature dramatically grows from tube surface temperature of 400 K to around 510 K and then reduces to 460 K.

Here in

Effects of different inlet bulk temperatures and mass flow rate have been investigated on temperature and pressure variation. As numerical results show, the value of pressure increases as the inlet mass flow rate grows and the temperature contours become sharper behind the tubes and the temperature boundary layer gets thinner as the inlet mass flow rates increase. The surface temperature reduces as the inlet bulk temperature passes over the bundle tubes with lower temperature and this value increases as the inlet flow temperature increases to the higher value than the surface temperature.

The author would like to thank both the Saudi Arabian Cultural Mission in Washington DC and King Abdulaziz University in Jeddah, KSA for their support.

Almas, M. (2016) Numerical Study of Fluid Flow over Bundle Tubes. Journal of Electronics Cooling and Thermal Control, 6, 109-119. http://dx.doi.org/10.4236/jectc.2016.63010