A review of heat transfer and fluid flow mechanism in heat exchanger tube with inserts

Kumar, Bipin; Srivastava, Gaurav; Kumar, Manoj; Patil, Anil Kumar

doi:10.1016/j.cep.2017.11.007

Cited by 106 publications

(26 citation statements)

References 65 publications

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“…A twisted tape insert creates swirling motions that modify the near wall velocity profile in a circular tube. Plenty of research has been conducted by researchers in using either a full‐length twisted tape or modifications to the full length . Uses of multiple tapes inside the circular duct, perforated twisted tapes, notched tapes, spaced twisted tapes, v‐cut type, and perforated tapes are a few cases of modification of the existing plane tape .…”

Section: Introductionmentioning

confidence: 99%

“…Plenty of research has been conducted by researchers in using either a fulllength twisted tape or modifications to the full length. 1,4 Uses of multiple tapes inside the circular duct, perforated twisted tapes, notched tapes, spaced twisted tapes, v-cut type, and perforated tapes are a few cases of modification of the existing plane tape. [5][6][7][8] These studies revealed that insertion of the twisted tape will enhance the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

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Parametric study on the heat transfer characteristics in a circular tube with helical tape insert under laminar flow conditions

Kumar

Dinesha

Narayanan

et al. 2019

Heat Trans. Asian Res.

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In the present study, the effect of a helical coiled tape on the heat transfer characteristics in a tubular heat exchanger has been studied. Numerical analysis is carried out in a tubular heat exchanger with a helical coiled tape insert under laminar flow conditions. The heat transfer characteristics, like Nusselt number (Nu) and friction factor (f), have been determined. Numerical modeling is undertaken and validated using analytical results. To study the parametric variation, simulation is carried out for different width ratios (WR) and twist ratios (TRs). It is observed that Nu increases as the WR is increased and the TR is reduced. The thermohydraulic performance index (THPI) is measured and found to be higher for a combination of a higher WR and a higher TR. From the tested values, it is seen that for a combination of WR = 3 and TR = 1.25, the maximum THPI was observed. It is concluded that both the tape width and pitch will significantly influence the thermohydraulic characteristics in a tubular heat exchanger with a helical tape insert inserted.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parametric study on the heat transfer characteristics in a circular tube with helical tape insert under laminar flow conditions

Kumar

Dinesha

Narayanan

et al. 2019

Heat Trans. Asian Res.

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“…The technique is widely applied in many areas such as power plants, automotive, aerospace, etc [2]. In this present investigation, the twisted tape turbulator (TTT) is broadly used in various fields [3]- [4]. Insertion of TTT in a duct provides a simple passive technique, to increase the heat transfer rate in the system there by increasing the swirl motion inside the duct, due to frequent variation in the surface geometry [5]- [7].…”

Section: Introductionmentioning

confidence: 99%

Augmentation of Heat Transfer in a Duct with Rotating Turbulator using Al2o3 Nanofluid

N*¹,

Sagar²,

Chethan³

2019

IJRTE

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The heat transfer enhancement is one of the essential factors to be considered in the design of heat exchangers. The rate of heat transfer can be enhanced by inserting and modifying the geometric configuration of the turbulators in the tube of heat exchangers. In our present work we conducted the experiment to investigate the rate of heat transfer enhancement in a tubular in a heat exchanger by using rotating twisted tape turbulator of twist ratio 3.27 using water and Al2O3 nanofluid as a testing fluid at the flow rate of 1, 2, and 3 LPM. The range of Reynolds number used is 2000<Re<10000, the heat transfer rate calculated for each case of rotating TTT with the speed of 0 to 300 RPM with the step of 100 RPM. The obtained results are compared between water and Al2O3 nanofluid, with and without rotating TTT. From the comparisons, it was found that the TTT with U-cut and the use of Al2O3 nanofluid gives the better rise in the heat transfer rate of about 39.63%. The augmented rate of heat transfer is due to the more turbulence when the rotating TTT is used and replacing the water with nanofluid as the testing fluid which of high thermal properties.

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“…Many researchers have performed the reviewing on passive or active heat transfer enhancement methods [3][4][5][6][7][8][9][10]. This paper focuses on the reviewing of the recent investigations about the heat transfer enhancement with coiled and twisted tape inserts which are widely used as a passive technique in tubular flow.…”

Section: Simple Definitions Used To Evaluate Heat Transfer Enhancementmentioning

confidence: 99%

A Review of Heat Transfer Enhancement Methods Using Coiled Wire and Twisted Tape Inserts

Keklikçioğlu¹,

Özceyhan²

2018

Heat Transfer - Models, Methods and Applications

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Heat transfer enhancement is categorized into passive and active methods. Active methods need external power to input the process; in contrast, passive methods do not require any additional energy to improve the thermohydraulic performance of the system. Passive methods are widely used in both experimental and numerical applications when investigating heat transfer enhancement and friction losses to save energy and costs. The many passive methods for increasing heat transfer rate include various components located in the fluid flow path, such as twisted tapes, coiled or tangled wires, and nozzle turbulators. The present paper represents a comprehensive review that focused on heat transfer enhancement methods with coiled wire and twisted tape inserts since the installation of inserts is easier and more economical. The thermodynamic performance of heat exchange components is also affected by the flow conditions such as laminar or turbulence. The present review comprises investigations on the enhancement of heat transfer using twisted tape and coiled wire inserts in laminar and turbulent flow region.

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A review of heat transfer and fluid flow mechanism in heat exchanger tube with inserts

Cited by 106 publications

References 65 publications

Parametric study on the heat transfer characteristics in a circular tube with helical tape insert under laminar flow conditions

Parametric study on the heat transfer characteristics in a circular tube with helical tape insert under laminar flow conditions

Augmentation of Heat Transfer in a Duct with Rotating Turbulator using Al2o3 Nanofluid

A Review of Heat Transfer Enhancement Methods Using Coiled Wire and Twisted Tape Inserts

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