Physical Model Of A Hydrodynamically Nonstationary Turbulent Flow

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MODULE 6: Worked-out Problems

For flow over a flat plate of length L, the local heat transfer coefficient h x is known to vary as x-1/2, where x is the distance from the leading edge of the plate. What is the ratio of the average Nusslet number for the entire plate to the local Nusslet number at x=L (Nu L)?

Drag Reduction by Fluid Slip

flow because the flow is non turbulent streamline flow in parallel layers. Thus, the study has been accomplished to turbulent flow in the past. The phenomenon of resistance to motion through a fluid is occurred due to fluid-wall interaction, and a real fluid does not usually slip on the wall in contact with it.

Force Convection of Laminar Liquid Flow inside Pipe Exerted

results according to turbulent bursting model. L. Redjem-Saad, et al : (2007) investigated direct numerical simulations of heat transfer in a fully developed turbulent pipe flow with isoflux condition imposed at the wall are performed for a Reynolds number Re = 5500. The temperature fluctuations and turbulent heat fluxes are


Figure 1. Physical model and coordinate system. The flow is assumed to be hydrodynamically and thermally fully developed in the simulations of turbulent forced convection in a channel. The two walls of the channel are heated with a constant and uniformly distributed heat flux. The physical properties of the fluid with a Prandtl number of 0.7,

PAPER OPEN ACCESS Heating Duration of Polyethylene Pipes for

Apr 14, 2020 hydrodynamic section as insignificant. Thus, a hydrodynamically and thermally stabilized turbulent flow occurs along the entire length of the pipe. We also assume that the heat-transfer agent is incompressible, its physical parameters are constant, friction heat and energy dissipation can be neglected.


In the study of contemporary fluid flow the phenom­ enon of transition from a laminar to a turbulent flow regime remains as probably the least understood, yet foremost prob­ lem of interest. After many years of investigation few theories about transition have born fruitful results. One concept that has provided a beneficial approach


flow characteristics from cross section to cross section are said to be uniform. Remember that flows can be either steady (not changing with time) or unsteady (changing with time). In this chapter we will look at laminar and turbulent flows in conduits and channels. The emphasis in this chapter is on steady uniform flow in straight channels

Investigation of Coriolis Forces Effect of Flow Structure and

forces effect on flow structure and heat transfer in a rotating dimpled channel. Two geometries with two dimple depths are considered, δ=0.2 and 0.3 of channel height, for a wide range of rotation number, Rob=0.0-0.70, based on mean bulk velocity and channel height. It is found that the turbulent flow