Laminar flow heat transfer in ordinary and augmented tubes

Hong, S. W.

doi:10.31274/rtd-180815-3719

Cited by 2 publications

(2 citation statements)

References 12 publications

(28 reference statements)

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“…In the present case, the Reynolds number is evaluated using the area of the plain tube. The correlation given shows good agreement for fluid with Pr = 100 [21]. However, in the present case, working fluid is water with Pr = 6.99.…”

Section: Problem Descriptionsupporting

confidence: 52%

“…The mean axial velocity magnitude for the tube with twisted tape is greater than that for the empty tube for all twist ratios and Reynolds numbers. This velocity is termed as swirl velocity, which was earlier reported by Hong [21] and Manglik and Bergles [4]. Besides decrease in the flow cross-sectional area, the longer flow path in the flow direction and helical nature of the flow are the reasons for this rise in the axial velocity magnitude.…”

Section: Axial Velocitymentioning

confidence: 75%

See 1 more Smart Citation

Effects of tangential and radial velocity on fluid flow and heat transfer for flow through a pipe with twisted tape insert—laminar flow

Chaware

Sewatkar

2018

Sādhanā

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The present study reports the numerical analysis of fluid flow and heat transfer in a pipe with full length twisted tape insert. The investigation is carried out for five different twist ratios of 4, 5, 6, 8 and 10 at 100 B Re B 1000. The velocity field in terms of streamwise, tangential and radial velocity and temperature field are studied as a function of Reynolds number and twist ratio. The variation of friction factor and Nusselt number with Reynolds number for different twist ratios is also presented. The heat transfer enhancement due to insertion of twisted tape mainly comes from the tangential and radial components of velocities, which are regarded as secondary fluid motion. It is evident from the results that with increase in Reynolds number the axial convection increases. However, with the decrease in the twist ratio, the tangential and radial convection increases, leading to increased heat transfer. The secondary flow affects the thermal boundary layer inside the tube and increases the cross-flow mixing, which increases the heat transfer. The correlations for prediction of friction factor and Nusselt number based on the numerical data are also proposed.

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Section: Problem Descriptionsupporting

confidence: 52%

Section: Axial Velocitymentioning

confidence: 75%