Effects of blockage on flow and heat transfer over a tube in cross flow

Nandanavanam, Jalaiah; Raghavan, Vijay R.

doi:10.1615/ihtc12.1460

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that studies made into these problems are still very few. For example, a recent study [17] involves the use of FLUENT universal computer codes and a monoblock grid to analyze the restrictive effect of the walls on unsteady-state flow and heat transfer in the vicinity of a cylinder arranged in a plane-parallel channel.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Unsteady-State Heat Transfer under Conditions of Laminar Transverse Flow past a Circular Cylinder

et al. 2005

View full text Add to dashboard Cite

Two-dimensional Navier-Stokes and energy equations are used to perform a numerical calculation of the parameters of unsteady-state flow and heat transfer under conditions of laminar transverse flow of a viscous incompressible fluid past a circular cylinder and at Re = 140. The process of formation of Karman vortex street is treated, as well as the cyclic heating of the near and far wakes behind the heated cylinder. Special attention is given to analysis of the behavior of the integral characteristics of flow and heat transfer, and the distributions of pressure, friction and heat-transfer coefficients on the cylinder surface, as well as to correlations of the parameters of flow and temperature at selected points in the vicinity of the cylinder. Evaluation is made of the effect of the factor of unsteadiness on the increment of power and heat loads in the process of flow past the cylinder.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Unsteady-State Heat Transfer under Conditions of Laminar Transverse Flow past a Circular Cylinder

et al. 2005

View full text Add to dashboard Cite

show abstract

“…This method is both time consuming and needs enormous computational power. It has been shown that when considering problems where flow takes place around bluff bodies these turbulent-models are often either unstable or not adaptable [1].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow and Heat Transfer at a Finned Tube in Crossflow

Rangan

Krishnamurthy

Raghavan

2003

Heat Transfer: Volume 3

Self Cite

View full text Add to dashboard Cite

In the present study, a numerical investigation has been carried out into the fundamental problem of airflow past and heat transfer from a circular finned cylindrical tube, placed in a duct. The simulation is carried out using a finite volume method, based on laminar calculation of the transport quantities and employs an unsteady, 3-D, second order upwind scheme. As the work has importance in applications of air-cooled heat exchangers, practical values have been chosen for air velocity, air temperature, fin spacing and clearance between fin outer diameter and duct wall. In experimental determination of the performance of a finned-tube bundle, only overall average values such as drag coefficient and overall Nusselt number are possible. Local measurements are well nigh impossible, as any measurement instrument introduced into the narrow fin space will immediately change the flow field. This work gives an insight into variations of shear and heat transfer that will help the designer to optimize the fin spacing. The validity of the results for instantaneous velocity profiles and Nusselt number distribution comes from their physical plausibility. The agreement of the logical behavior of the studied variables when the fin space or fin clearance is modeled confirms the adequacy of the numerical simulation. The strong viscous effects caused by decreasing the fin space result in an increase in Cd and change in its frequency. Vortices generated on the rear section of the tube are damped, but the flow still shows small oscillations downstream of the tube, which indicates that vortex generation still exists, but has changed its location. Vortices augment the Nusselt number locally with increasing fin distance. Simultaneously, the opposite effect of converging boundary layers and therefore accelerated core flow in the fin space yields a maximum in the average Nusselt number as a function of fin space. The impact of decrease in the clearance between the tube and the duct wall is not as important as the effects of fin space.

show abstract

Fluid Flow and Heat Transfer from Circular and Noncircular Cylinders Submerged in Non-Newtonian Liquids

Chhabra

2011

Advances in Heat Transfer Volume 43

View full text Add to dashboard Cite

Effects of blockage on flow and heat transfer over a tube in cross flow

Cited by 3 publications

References 0 publications

Numerical Simulation of Unsteady-State Heat Transfer under Conditions of Laminar Transverse Flow past a Circular Cylinder

Numerical Simulation of Unsteady-State Heat Transfer under Conditions of Laminar Transverse Flow past a Circular Cylinder

Analysis of Flow and Heat Transfer at a Finned Tube in Crossflow

Fluid Flow and Heat Transfer from Circular and Noncircular Cylinders Submerged in Non-Newtonian Liquids

Contact Info

Product

Resources

About