A REVIEW PAPER OF TWISTED TAPE INSERTS

A REVIEW PAPER OF TWISTED TAPE INSERTS

Bhanu Pratap Singh

Research Scholar, Department of Thermal Engineering Research,

Faculty of Technology, Uttarakhand Technical University

Dehradun, Uttarakhand, India.

[email protected]

ABSTRACT

This paper presents an intensive review of heat exchangers

with twisted tape inserts. The main motive of this work to find

out the best possible efficient heat exchanger configuration.

Heat exchanger with wire coil inserts has highest heat

exchanging capability. Double counter twist inserts

outperformed other configuration when thermohydraullic

performance is considered.

INTRODUCTION

In this era of industrialization and modernization, energy play

vital role in the development of nation. Solar air heater[1-2] ,

solar water heater[3-4] and heat exchanger are the main

components of thermal energy systems. Heat exchangers are

key components of refrigeration[5-7] and cryogenic

systems[8]. Efficient heat exchangers are the need of today

world, as the fossil fuels depleted with very fast rate[9] .

A Review of Heat transfer features of diverse inserts.

Twisted Tape inserts

The Twisted Tape inserts fir introduced by Sir Whitham et

al. There are many kinds of Twisted Tape inserts used for heat

transfer enhancement factor.

Inserts play important role as turbulence promoters in the heat

exchangers .The different types of the inserts used yet is

shown in Table.1.

There are number techniques used in heat exchanger for

creating turbulence in flow. A lot of study has been done by

number of researchers for creating turbulence in flow field of

heat exchanger.

Inserts are modified as per previous study in augmentation of

thermo-hydraulic performance. Passive techniques are

always in keen interest as these are economic. Inserts also

give compactness to heat exchangers. The inserts the strips of

mertals with different geometrical configuration. The types of

twisted tapes are as follows:

1.Tapes with twist ratio

2. Perforated Tapes

3. Cut Tapes

4.Doble twist tapes

5.Dimple tapes

6.Coupling

7.V-cut tapes

8.V-finned

9.Tappered

10.Clock wise twisted

11.NonUniform tapes

12.Continious spaced

13.Trapaziodial

14.Quadrapule cut

15.U cut

16.Multiple quadrapule

17.Double v- ribbed

18. Perforated and helical etc.

The description of tapes are presented in Table.1 given below.

International Journal of Applied Engineering Research ISSN 0973-4562 Volume 14, Number 9, 2019 (Special Issue) © Research India Publications. http://www.ripublication.com

Page 58 of 65

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Text Box

Table 1: TUBE INSERT DEVICES

Type of Twisted Tapes Re Range Figure

Perforated [10] 5000-20,000

Full length dual regularly spaced [11] 4000-19,000

Alternate clockwise & counter clockwise [12] 830-1990

Delta winglet [13] 3000-27,000

Coupling [14] 6000-15,000

Multiple [15] 2700-9000

Trapezoidal cut [16] 2000-12000


Page 59 of 65


Short length [17] 4000-20000

V-Finned 18] 4000-30000

Non uniform coil & twisted tape[19] 4600-20000

Tapered [20] 6000-20000

Non uniform 21] 4000-16000

Dimple tube with a twisted tape[22] 12000-44000

Trapezoidal cut plain [23] 2000-12000


Page 60 of 65


Multiple quadruple counter [24] 5000-30000

Wire coil inconjuction with twisted tape [25] 3000-18000

Double V-Ribbed [26] 5300-24000

U cut [27] 2000-12000

Perforated helical [28] 6000-20000

Twin Delta winglet [29] 5000-15000

Cross hollow [30] 5600-18000


Page 61 of 65


Regularly spaced quadruple [31] 7000-25000

GRAPHS

Fig. 1. Effect of Re on Nusselt number enhancement ratio

0

1

2

3

4

5

6

7

8

4000 8000 12000 16000 20000

sdtt

cctt

mtt

sltt

vfctt

dwct

ttt

dttt

tctt

mqtt

wcctt

dvrtt

tdwtt

chtt

rqutt

dctt

coctt

NU/N

US

Re

Sdtt – single dual twisted tape

Cctt – co coupling twisted tape

Coctt – counter coupling twisted tape

Mtt – multiple twisted tape

Sltt – short length twisted tape

Vfctt – v finned counter twisted tape

Dwct – Di wire coil with twisted tape

Ttt – tapered twisted tape

Dttt – dimpled tube twisted tape

tctt – trapezoidal cut twisted tape

mqtt – multiple quadruple twisted tape

wcctt – wire coil inconjection with twisted tape

dvrtt – double v ribbed twisted tape

tdwtt – twin delta winged twisted tape

chtt – cross hollow twisted tape

rqutt – regularly spaced quadruple twisted tape

dctt – double counter twisted tape


Page 62 of 65

Fig. 2. Effect of Reynolds number on η for air as fluid

0

0.5

1

1.5

2

2.5

3

1 2 3 4 5

sdtt

cctt

mtt

sltt

vfctt

dwct

ttt

dttt

tctt

mqtt

wcctt

dvrtt

tdwtt

chtt

rqutt

dctt

cocttRe

η

Sdtt – single dual twisted tape

Cctt – co coupling twisted tape

Coctt – counter coupling twisted tape

Mtt – multiple twisted tape

Sltt – short length twisted tape

Vfctt – v finned counter twisted tape

Dwct – Di wire coil with twisted tape

Ttt – tapered twisted tape

Dttt – dimpled tube twisted tape

tctt – trapezoidal cut twisted tape

mqtt – multiple quadruple twisted tape

wcctt – wire coil inconjection with twisted tape

dvrtt – double v ribbed twisted tape

tdwtt – twin delta winged twisted tape

chtt – cross hollow twisted tape

rqutt – regularly spaced quadruple twisted tape

dctt – double counter twisted tape


Page 63 of 65

RESULT AND DISCUSSION

The Thermo hydraulic performance parameter (η) defined

below by eq 1.

η =𝑁𝑢/𝑁𝑢𝑠

(𝐹

𝐹𝑠)1/3

S – Smooth tube

Fig 2: shows the graph of different geometries of inserts used

for air .The graph of thermal performance factor for air tell that

efficiency diminish with growing values of Reynold number in

each case. The thermal performance factor of non uniform coil

and twisted tape lies in the range of 2.5 – 2.7 and other are

below this range so the better thermal performance factor is for

non uniform coil and twisted tape.

Hence, thermo hydraulic efficiency for inserts used has better

performance .

CONCLUSIONS

This review paper emphasize on different TT.

Thus we selected diverse TT layouts for two working fluids

first is air and second is water, and we got different result of

thermal performance factor, nusselt number, friction factor. We

got thermal performance factor more than unity for maximum

geometry of twisted tape inserts of air as a working fluid & got

thermal performance factor more than unity for each geometry

of twisted tape inserts of water as a working fluid. The

maximum thermal performance factor for water is 2.3 for

trapezoidal cut twisted tape (TCT) and for air maximum

thermal performance factor is 2.7 for DI coil and twisted tape

(DCTT).

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A REVIEW PAPER OF TWISTED TAPE INSERTS