Comparative study of heat transfer characteristics of a tube equipped with X-shaped and twisted tape insert

Paneliya, Sagar; Khanna, Sakshum; Mankad, Vishrut; Ray, Abhijit; Prajapati, Parth; Mukhopadhyay, Indrajit

doi:10.1016/j.matpr.2020.01.103

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…The study also observed that in the case of HLUTT and HLDTT tapes, there is a decrease in the thermal performance factor with an increase in Re and twisted ratios which are showing in Figure 4, whereas in the case of FLTT, the thermal performance factor tends to increase with different twisted ratios and improvements of Re [12]. Paneliya et al, [13] found 1.27 times larger heat transfer enhancement for X-Shaped tapes than twisted tape inserts by comparing the thermal characteristic of water flowing in a tube equipped with X-tape and twisted tape to investigate the effect of insert tape geometry on the heat exchanger tubes [13]. The material of the insert tapes was stainless steel in this study.…”

Section: Twisted Tape Insertsmentioning

confidence: 69%

“…(3) The thermal performance factor decreases with an increase in Re and twist ratios in the case of HLUTT and HLDTT twisted tapes. Twisted Tapes (X-shaped and twisted tape insert) [13] Water Twist ratio= (3,4); Nusselt Number = (2.91 to 5.16 for the Xshaped and 2.52 to 4.46 and 3.07 to 5.33 for constant and variable pitch twisted tape)…”

Section: Discussionmentioning

confidence: 99%

“…As can be seen from the figure the twisted tape inserts have the highest heat transfer enhancement of 400% followed by that for air-foil shaped inserts having a value of 300% followed by that for nanofluids with baffles having a value of 255% followed by that for wire coil having a value of 9%. PTTT [11] X-shaped tape insert [13] Sparsely placed TT [14] Segmented TT [16] TT with helical tube [17] Wire coil Insert…”

Section: Wire-coil Insertsmentioning

confidence: 99%

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Review on Heat Transfer Enhancement by Insert Devices

Ahmed

Abedin

2020

IJEMM

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The scientists revise the heat transfer enhancement techniques time to time to achieve better performance and to obtain optimized designs of heat exchangers. The present study reviews the performance and techniques of heat transfer enhancement using various insert devices such as twisted tape and wire coil insert as well as completely different forms of other inserts like air-foil shape inserts, X-shaped twisted tape inserts, baffles and V-winglets inserts with various types of medium and nanofluids. According to the summary of recent significant researches on the heat transfer enhancement by using different types of inserts and combinations of these inserts with various nanofluids showed that insert can indicatively enhance the heat transfer rate by modifying its geometry or configurations like twist ratio, length ratio, pitch ratio, segmented tape, perforated tape, angle of arrangements and insert quantities and so on which caused a considerable impact on performance characteristics of heat transfer enhancement along with the pressure drop and friction factor. It is revealed through reviewing the related literature that the highest value of equivalence heat transfer enhancement is as maximum as 400%, 300% and 9% for the twisted tape insert with helical tube, the air foil shaped inserts and for the wire coil inserts, respectively when compared with the smooth tube. In the case of baffles in nanofluids, as maximum as 255% equivalence heat transfer enhancement could be achieved when compared with that of baffles without nanofluids.

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Section: Twisted Tape Insertsmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Wire-coil Insertsmentioning

confidence: 99%

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Review on Heat Transfer Enhancement by Insert Devices

Ahmed

Abedin

2020

IJEMM

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“…Other than twisted tape, X-shaped tape also becomes a promising shape in order to manipulate the fluid flow inside a tube. Paneliya et al 92 has conducted a comparative study between X-shaped tape and twisted tape. Based on the experimental results, the heat transfer rate produced with X-shaped tape inserts is 1.27 while twisted tape is 1.08 higher as compared to smooth tube.…”

mentioning

confidence: 99%

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

Ahmad

Abdullah

Sopian

2020

Advances in Mechanical Engineering

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Working fluid with higher thermal conductivity and tube with better fluid mixing are two crucial elements for heat transfer enhancement in heat exchanger system. Hence, several methods and techniques have been explored to improve heat transfer efficiency, including dispersing nanoparticles into conventional heat transfer fluid and inserting instruments inside the tube of the heat exchanger. Studies have shown that nanofluid can improve heat transfer efficiency of the system due to its higher thermal conductivity and drastic Brownian motion of nanoparticles while inserts within tube can improve heat transfer efficiency by increasing axial velocity of working fluid for better fluid mixing. This article summarized 109 of journals from recent research on heat transfer enhancement of nanofluid flowing inside the tube with inserts as well as discussing the significant parameters that affected the system’s efficiency such as nanoparticles’ volume fraction, Reynolds number and types and configurations of inserts. Ultimately, analysis will be carried out to determine the most suitable modification of twisted tape inserts with the most optimum value of nanoparticle volume fraction for turbulence flow regime. Finally, some problems that need to be solved for future research such as agglomeration and pressure drop are discussed.

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