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Heat Exchanger Lab Report

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Heat exchanger is an equipment to exchange heat energies with the surrounding fluid. They are widely used in chemical plant, petroleum refineries and HVAC systems. Heat exchanger are typically categorised with type of arrangement and type of construction. In the pallbearer flow arrangement, the hot and cold fluid flows in the same direction whereas in the counter flow arrangement the fluids enter at the opposite end. The counter flow is more efficiency at exchanging the heat energy due to its larger average temperature difference.

Another type of heat exchanger is known as shell and tubes configuration. Tube bundle is the sub component in this type of configuration. The baffled is installed to support the bundle tube, induce the turbulence …show more content…

The flow of the real fluid in bundle of tube has significant difference compared to single tube. The flow in single tube is influenced by the Reynold number of the fluid as higher velocity cause the layer separation and forming wake region. However, in the flow across bundle of tube, the flow is influenced by the spacing and the pattern of the flow. Close spacing of the tube may prevent the interspace mixing of the fluid to enhance heat transfer.
There are two types of pattern the tubes can be aligned: inline and staggered. The pitch distance which is the distance between the centre of the tubes is the main parameters in this investigation. The two alignment differs in the fluid flow path with different mixing level of fluid element. The rate of heat transfer of forced convective heat transfer is measured by the Nusselt number of the tube.

Flow past a single tube with ideal …show more content…

The assumption is made with the ideal fluid which ignored the effect of viscosity. the presser distribution is derived using the Bernoulli principle from free stream velocity as such

Another assumption is made by ignoring elevation changes. The pressure distribution formula indicated an symmetrical pressure distribution by using the relation vps The velocity is zero at the front portion and the back of the body,the maximum value occur at the angle =90.the symmetrical pressure distribution intuitively indicated that the tangential component of the force will cancel each other and impose no drag force on the body.mathematicallly this could be shown by integrating the pressure over the surfaceon the body yielding As the formula shown its drag force is zero.this clary contradict the natural phenoimena whetreby the body will drag by fluid.the mistake made in this formulation is the non exixtence of fluid shaering due to viscocity.a comparison of the real pressure distribution and theritical formulation nis shown in the pic

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