A Numerical Study on Heat Transfer in Laminar Pulsed Slot Jets Impinging on a Surface
Numerical simulations are performed for laminar
continuous and pulsed jets impinging on a surface in order to
investigate the effects of pulsing frequency on the heat transfer
characteristics. The time-averaged Nusselt number of pulsed jets is
larger in the impinging jet region as compared to the continuous jet,
while it is smaller in the outer wall jet region. At the stagnation point,
the mean and RMS Nusselt numbers become larger and smaller,
respectively, as the pulsing frequency increases. Unsteady behaviors
of vortical fluid motions and temperature field are also investigated to
understand the underlying mechanisms of heat transfer enhancement.
 V. A. Chiriac, and A. Ortega, "A numerical study of the unsteady flow
and heat transfer in a transitional confined slot jet impinging on an
isothermal surface," Int. J. Heat Mass Tran., vol. 45, 2002, pp.
 H. G. Lee, H. S. Yoon, and M. Y. Ha, "A numerical investigation on the
fluid flow and heat transfer in the confined impinging slot jet in the low
Reynolds number region for different channel heights," Int. J. Heat Mass
Tran., vol. 51, 2008, pp. 4055-4068.
 H. J. Poh, K. Kumar, and A. S. Mujumdar, "Heat transfer from a pulsed
laminar impinging jet," Int. Commun. Heat Mass, vol. 32, 2005, pp.
 R. C. Behera, P. Dutta, and K. Srinivasan, "Numerical study of
interrupted impinging jets for cooling of electronics," IEEE T. Compon.
Pack. T., vol. 30, 2007, pp. 275-284.
 P. Xu, B. Yu, S. Qiu, H. J. Poh, and A. S. Mujumdar, "Turbulent
impinging jet heat transfer enhancement due to intermittent pulsation,"
Int. J. Therm. Sci., vol. 49, 2010, pp. 1247-1252.
 R. Sau, and K. Mahesh, "Optimization of pulsed jets in crossflow," J.
Fluid Mech., vol. 653, 2010, pp. 365-390.