Hydrodynamic and Thermal Performance Twisted Tape Insert Provided in Heat Exchanger Tubes: A Review

Kumar, Anil; Datt, Ravi; Bhist, Mangal Singh; Kothiyal, Alok Darshan; Maithani, Rajesh

doi:10.5098/hmt.12.26

Cited by 5 publications

(3 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For practical applications, researchers found PATT as an effective passive tape inset to save energy and operating costs. Datt et al (2019) reviewed the works of different researchers related to the hydrodynamic and thermal performance of inserts as TT. Researchers observed the performance of an insert is affected by the twist pitch and the twist angle.…”

Section: Experimental Studies On Ttmentioning

confidence: 99%

Improvement of Heat Transfer Through Use of Twisted Tape Inserts: A Review

2024

EPPM-Journal

View full text Add to dashboard Cite

The objective of this review paper is to identify the gap in finding out the direction toward the enhancement of heat transfer and the performance of heat exchangers. Heat exchangers can be found in many applications ranging from engineering devices to household consumer appliances. Heat exchangers must offer a good heat transfer performance apart from saving energy. Heat transfer enhancement techniques help to save energy and cool hot components in the design of electronic and mechanical circuits. However, enhancement in heat transfer takes place at the cost of a bearable increase in friction losses and pressure drop. Therefore, miniature heat exchanger systems and the cost of energy, motivate industries to use energy-saving methods in their design. With aging, the most common problem in heat exchangers is the reduction in heat transfer rate. Numerous studies have proved that placing a disturbance occurs in the fluid flow path and it can help to increase the heat transfer rate in the case of worn-out heat exchangers. For decades, researchers are numerically investigating the effects of various kinds of insert tape to improve the heat transfer operation in the heat exchangers. As heat exchangers form the backbone of many industrial processes, the idea of saving energy with the design of a cost-effective tape insert motivated us to work on this area of research. The paper proposes the new model of heat exchanger with an insert having a trapezoidal cut on both sides of an insert and using the different ratios of twist experimentation that will perform and compare the output with the previous studies by using different fluid or phase change materials as a fluid to maximize the performance of heat transfer rate. Also, it aims to find out the impact on friction factor as well pressure drop in the heat exchanger when there is a change in ratios of twist. This research aims to review the findings of earlier researchers in this area and to utilize the knowledge for improving the heat transfer rate of conventional tubes in our future work.

show abstract

Section: Experimental Studies On Ttmentioning

confidence: 99%

Improvement of Heat Transfer Through Use of Twisted Tape Inserts: A Review

2024

EPPM-Journal

View full text Add to dashboard Cite

show abstract

“…A thorough review work was presented by Datt et al [12] concerning recent studies on augmentation of hydrodynamic and thermal performance of various twisted tape inserts in heat exchanger tubes. Thermal and hydrodynamic correlations for various twisted tape elements were summarized that included a comparative performance of multiple twisted tapes in a single conduit.…”

Section: Introductionmentioning

confidence: 99%

Comparing single-phase thermal hydraulic performance of a right and left turn twisted tape insert in a tube

Abbas¹,

Ayub²,

Ayub³

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

Single-phase heat transfer and pressure drop tests were conducted in a tube with two types of twisted tapes. Each tape had exactly similar physical parameters and were made of the same material except that each had an opposite twist that resulted in a clockwise and anticlockwise flow swirl, i.e., left turn and right turn, respectively. Each type had twist ratio of 4 and 5.5 on a 180° twist. The tapes were tested in a tube-in-tube heat exchanger having 2 m length. The internal tube of the heat exchanger had 19.05 mm outer diameter and 1.65 mm wall thickness. Fresh water and 30% water/glycol solution were used as cold and hot fluids. Experiments were performed with Reynolds number varying between 2500 and 11,500 at Prandtl numbers of 9 and 14. Heat transfer and pressure drop enhancement was observed compared to plain tube at all operating conditions with 6-7% higher thermal performance with tighter twist tape. The Left Turn tape with a twist ratio of 5.5 showed slightly better thermal performance beyond Re > 8000 and with a twist ratio of 4 beyond Re > 4000. Similar trends were observed for the pressure drop. This is the first time a study on the subject was initiated assuming that the earth's rotational effect "could" play a role in the flow swirl pattern inside a conduit. It is recommended to carry out intensive work on the subject with different tape twist ratios, fluids and more importantly larger conduits. The information generated could be of interest to the Concentrated Solar Power industry that uses high-temperature thermal oils. Any improvement in performance could result in lowering the operational cost, and therefore suitable type of twisted tapes could be used for upper and lower hemispheres. Keywords Heat transfer • Pressure drop • Twisted tape • Single phase Abbreviations D Diameter, m DP Pressure drop, kPa L Length, m LT Left turn twisted tape L/D Twist length-to-diameter ratio (twist ratio) Nu Nusselt number, dimensionless Pr Prandtl number, dimensionless Re Reynolds number, dimensionless RT Right turn twisted tape

show abstract

“…They observed that the system performance factor relies on different parameters including refrigerant mass velocity, vapor quality, and geometry of inserts. More discussions regarding the performance of twisted tape inserts in heat exchangers are provided by Kumar et al [20], Bucak and Yilmaz [21], Dewan et al [22], Liu and Sakr [23], and Garg et al [24].…”

Section: Introductionmentioning

confidence: 99%