2015
DOI: 10.1016/j.ijthermalsci.2015.02.019
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Experimental and numerical study of fluid flow and heat transfer in an annulus of inner twisted square duct and outer circular pipe

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Cited by 72 publications
(16 citation statements)
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“…The thermal performance of an annular tube with an inner twisted square tube has been experimentally and numerically investigated by Bhadouriya et al [24]. The results showed that the Nu increases as Re and Pr increase, and decreases as the twist ratio increases.…”
Section: Of 15mentioning
confidence: 99%
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“…The thermal performance of an annular tube with an inner twisted square tube has been experimentally and numerically investigated by Bhadouriya et al [24]. The results showed that the Nu increases as Re and Pr increase, and decreases as the twist ratio increases.…”
Section: Of 15mentioning
confidence: 99%
“…Re varies from 1000 to 15,000, including laminar and turbulent states. The experimental data reported by Bhadouriya et al [24] indicated that the flow is considered to be laminar at Re ≤ 3000 and turbulent at Re > 3000. The continuity, momentum, and energy equations are:…”
Section: Of 15mentioning
confidence: 99%
“…The enhancement system of heat transfer is great significance in improving the performance of these applications. So to implement this goal, many techniques such as (twisted tape, coils, louvers, rings, etc…) can be inserted in heat exchangers to augmentations heat transfer convection by increasing turbulent intensity [2].The earliest works on augmentation, Eiamsa-ard, Promvonge [3], investigated experimentally the convective heat transfer and friction factor characteristics in citcular tube with V-nozzle inserts at a uniform heat flux.Three pitch ratios (PR) of V-nozzle were considered in this study (PR==2.0, 4.0, and 7.0).The results showed that V-nozzle have a significant effect on the enhancement of heat transfer rate at about 27% over plain tube. It is found that the smaller pitch ratio (PR=2.0) gives a maximum enhancement about 1.19 due to reverse/ re-circulation flow.…”
Section: Introductionmentioning
confidence: 99%
“…In [11], the actual pipes are deployed in a helical coil pattern. Other enhanced double-pipe heat exchangers involved features such as [12,13] (fins), [14] (louvered strips), [15] (ring protuberances), [16] (twisted inner square tube in an outer circular tube), [17] (bulbous protrusions in the inner tube wall), and [18,19] (two helically-wrapped circular tubes). The literature involving corrugated double pipe heat exchangers is virtually exclusively concerned with experimentation.…”
Section: Introductionmentioning
confidence: 99%