Experimental studies on heat transfer and pressure drop characteristics for new arrangements of corrugated tubes in a double pipe heat exchanger

Dizaji, Hamed Sadighi; Jafarmadar, Samad; Mobadersani, Farokh

doi:10.1016/j.ijthermalsci.2015.05.009

Cited by 151 publications

(18 citation statements)

References 16 publications

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“…Heat transfer enhancement in the range of 20-200% and relatively low-pressure drop have been achieved using this method. 35 Compared to the use of tube inserts, surface corrugation/fins is more suited for the design of energy efficient heat exchangers. Although the best existing approach for realising energy efficient heat exchangers is doubly enhanced tubes with micro helical fins, the cost of fabricating doubly enhanced tubes is a barrier to their widespread application.…”

Section: Heat Transfer Enhancement In Heat Exchangers Employed With C...mentioning

confidence: 99%

Design and testing of energy-efficient heat exchangers for Newtonian and non-Newtonian fluids – A review

Jayesh

Mukkamala

John

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Heat transfer enhancement, pumping power and weight minimization in enhanced heat exchangers has long been achieved by deploying tubes with internal surface modifications like microgrooves, ribs, fins, knurls, and dimples with and without tube inserts. This article presents a very extensive review of experimental and computational studies on heat transfer enhancement, which covers convectional and unconventional working fluids under different fluid flow conditions. Compound augmentation with tube surface modifications and inserts has yielded enhancements in the overall heat transfer coefficient of over 116% in the fully developed turbulent flow regime. Exotic fluids like nano-coolants deployed in spiral grooved mircofin tubes yielded 196% enhancement in tube side heat transfer rate for concentrations as low as 0.5% by volume, while the thermal efficiency index measuring the overall enhancement in relation to the pumping power was 75%. However, reviews that address the combined effect of unconventional fluids, surface modifications and tube inserts on the overall thermo-hydraulic performance of annular heat exchangers seem to be limited. Further, nano-coolants aren’t frequently used in the process industry. The goal of this study is to document and evaluate the impact of cost-effective and energy-saving passive enhancement techniques such as tube surface modifications, tube inserts, and annular enhancement techniques on annular heat exchangers used in the process industries with Newtonian and non-Newtonian fluids. This review should be useful to engineers, academics and medical professionals working with non-Newtonian fluids and enhanced heat exchangers.

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Section: Heat Transfer Enhancement In Heat Exchangers Employed With C...mentioning

confidence: 99%

Design and testing of energy-efficient heat exchangers for Newtonian and non-Newtonian fluids – A review

Jayesh

Mukkamala

John

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Corrugation of tubes and channels is considered an efficient passive method to augment the rate of heat exchange. The thermal-flow features of turbulent flow in corrugated tubes are reported extensively in many articles (for example [4][5][6][7][8]).…”

Section: Introductionmentioning

confidence: 99%

Thermal-Hydrodynamic Characteristics of Turbulent Flow in Corrugated Channels

Dhaidana¹,

Abbas²

2020

Boundary Layer Flows - Theory, Applications and Numerical Methods

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The heat transfer-flow characteristics of turbulent flow inside corrugated channels heated by constant heat flux are numerically investigated. The rate of heat transfer, pressure drop, and performance evaluation criterion is determined for smooth channel and various designs of corrugated channels at the Reynolds number ranged from 5000 to 60,000. The effect of rib arrangement distributions of inward, outward, and inward-outward ribs are examined. The various rib configurations of corrugated channels are also tested. In addition, the influences of rib roughness parameters (height, pitch, and width) and rib shapes (semicircular, trapezoidal, and rectangular) are researched. The Reynolds-averaged Navier-Stokes equations (RANS) are used to model the governing flow equations. The computational model is validated through a reasonable agreement between the present numerical results and the outcomes of related works. For different geometrical and operating conditions, the results revealed that the rate of heat exchange in corrugated channels exceeds higher than that of smooth ones but with additional pressure loss. Moreover, the rib arrangements, rib configuration, and rib roughness parameters exhibit a relatively significant effect on the performance of the corrugated channels. On the other hand, the influence of the rib shapes seems to be small.

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“…Corrugations on the walls of helically coiled tubes provide up to 25% heat transfer enhancement with a slight increase in friction factor by 2.5% . Several other studies focused on corrugated and grooved tubes to analyze heat transfer and fluid flow behavior were reported in the literature …”

Section: Introductionmentioning

confidence: 99%

“…10 Several other studies focused on corrugated and grooved tubes to analyze heat transfer and fluid flow behavior were reported in the literature. [11][12][13][14][15][16] Fan and colleagues, developed a numerical model to check the thermal performance of dimpled fin surfaces. Without additional pressure drop, a 30% improvement in heat transfer was obtained compared with flat plate fins.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer analysis of plain and dimpled tubes with different spacings

Afzal

A.D²,

Javad

et al. 2017

Heat Trans. Asian Res.

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Heat transfer enhancement by modifying the surface of tubes is commonly practiced throughout the world. Grooves, dimples, flutes or corrugations are placed inside and outside the surface of tubes and channels for enhancement. In this article, a novel method for heat transfer enhancement by varying the spacing between the tubes is reported. A comparison is made between the heat transfer performance of plain tubes and dimpled tubes at different spacings. For analysis, an experimental setup is fabricated and assembled. The flow is externally forced laminar flow of air over a hot tube maintained at constant temperature. Four different velocities of air 0.4, 0.6, 0.8, and 1.0 m/s are considered in this study. Tube surface temperature, heat transfer coefficient, heat transfer rate and Nusselt number are the parameters studied to analyze the thermal behavior of tubes at different spacings of 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 cm. From the experimental investigation it is found that, apart from heat transfer enhancement by providing dimples on the tube surfaces, there is an optimal spacing between the tubes after which no further improvement is obtained. In this study, 3.0 cm is found to be the optimal spacing for both plain and dimpled tubes. However, the percentage value of heat transfer enhancement is greater with optimal spacing and for all velocities of air in dimpled tubes.

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Experimental studies on heat transfer and pressure drop characteristics for new arrangements of corrugated tubes in a double pipe heat exchanger

Cited by 151 publications

References 16 publications

Design and testing of energy-efficient heat exchangers for Newtonian and non-Newtonian fluids – A review

Design and testing of energy-efficient heat exchangers for Newtonian and non-Newtonian fluids – A review

Thermal-Hydrodynamic Characteristics of Turbulent Flow in Corrugated Channels

Heat transfer analysis of plain and dimpled tubes with different spacings

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