Review of Heat Transfer Augmentation Through Different Passive Intensifier Methods

Gupta, Anirudh

doi:10.9790/1684-0141421

Cited by 30 publications

(12 citation statements)

References 7 publications

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“…Investigation of the influence of dimples/protrusion as a surface roughness on boiling are rarely reported in literature, but its influence on single phase flow are studied, extensively. Gupta and Uniyal [7] reported that the use of dimples over the heat exchanger tube surface can be very advantageous in relation to other enhancement methods due to the simplicity of their manufacturing process and no extra cost in raw materials or labor. Suresh et al [8] performed an experimental investigation on the convective heat transfer and friction factor characteristics in the plain and helically dimpled tube in single-phase flow with constant heat flux and using CuO/water nanofluid as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Evaporation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes

Shafaee

Mashouf

Sarmadian

et al. 2016

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Evaporation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes

Shafaee

Mashouf

Sarmadian

et al. 2016

Applied Thermal Engineering

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“…They increase heat transfer coefficients by disturbing existing flow behaviour (except for extended surfaces) which also leads to increases in pressure drop. Some of common methods for heat transfer enhancement by passive techniques are achieved by using [6];…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of fluid flow and heat transfer in an annulus of inner twisted square duct and outer circular pipe

Bhadouriya

Agrawal

Prabhu

2015

International Journal of Thermal Sciences

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“…Enhanced inner surfaces are commonly used because they can produce higher heat transfer coefficient with a small pressure drop penalty. Moreover, Gupta and Uniyal [8] reported that the use of dimples over the heat exchanger tube surface can be very advantageous in relation to other enhancement methods due to the simplicity of their manufacturing process and no extra cost in raw materials or labor. Recently, Kukulka and Smith [9] evaluated the relationship between heat transfer enhancement and the surface geometry of tubes which were produced by Vipertex TM and have been named EHT (Enhanced Heat Transfer) tube ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Condensation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes

Sarmadian

Shafaee

Mashouf

et al. 2017

Experimental Thermal and Fluid Science

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In the present study, condensation heat transfer and frictional pressure drops of refrigerant R-600a (iso-butane) inside a helically dimpled tube and a plain tube of internal diameter 8.3 mm were measured and analyzed. All tests were performed at different vapor qualities up to 0.82 and average saturation temperatures ranging between 38 and 42℃. Refrigerant mass fluxes varied in the range of 114-368 kg/m 2 s. The inner surface of the helically dimpled tube has been designed and reshaped through three-dimensional material surface modifications consists of both shallow and deep protrusions which are placed evenly in helical directions on the tube wall. The experimental results show that the heat transfer coefficients of the dimpled tube are 1.2-2 times of those in smooth tube with a pressure drop penalty just ranging between 58% and 195%. The highest heat transfer coefficient is occurred at vapor quality of 0.53 and mass flow rate of 368 kg/m 2 s. On the other hand, the maximum increase of pressure drop takes place at vapor quality of 0.55 and mass flow rate of 368 kg/m 2 s. Nomenclature ݉ሶ mass flow rate (kg/s) A C p surface area (m ଶ ) specific heat (kJ/kg k)

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Review of Heat Transfer Augmentation Through Different Passive Intensifier Methods

Cited by 30 publications

References 7 publications

Evaporation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes

Evaporation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes

Experimental and numerical study of fluid flow and heat transfer in an annulus of inner twisted square duct and outer circular pipe

Condensation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes

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