Experimental investigation of heat transfer in a tube heat exchanger with airfoil-shaped insert

The never-ending demands of humans have led researchers to find more efficient energy conversion technologies. Enhancing heat transfer rate in a tubular heat exchanger through curved circular rings is one type of passive method that is studied in this work. The computational analysis has been done using "FLUENT" module of ANSYS 16.0. The tubular heat exchanger has internal diameter of 68.1 mm, length of 1.5 m and constant heat flux of 1000 W m −2. Air is the working fluid, which flows in Re varying from 3000 to 21,000. After reaching steady state conditions, the Nusselt number and friction factor are calculated for CCR rings. Furthermore, perforation has been done on these rings with perforation index 8, 12 and 16% and thermo-hydraulic properties are investigated. Computational results show that perforating the rings have a significant effect on heat transfer and friction factor. Greater the perforation index, greater is the Nu and TPF. The maximum enhancements obtained in Nu and TPF are 7.4 and 1.56 times, respectively (as compared to that of smooth tube), for PCCR-16%.

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“…[27] Promvonge et.al. [28] Gururatna and skullong [29] Present Study Fig. 11 Comparison with previous work…”

Section: Tpf Rementioning

confidence: 55%

“…In this section, the TPF of present work is compared with some common inserts previously used by researchers like serrated twisted tape by Eiamsa-ard et al [27], inclined vortex rings by Promvonge et al [28] and airfoil shaped geometry by Gururatna and Skullong [29]. It can be noticed from Fig.…”

Section: Comparison With Previous Workmentioning

confidence: 92%

CFD analysis for thermo-hydraulic properties in a tubular heat exchanger using curved circular rings

Singh

Kharkwal

Gautam

et al. 2020

J Therm Anal Calorim

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“…Gururatana and Skullong [23] was chosen the aerofoil-shaped inserts, modified-NACA0024 to improve the heat transfer performance in the tubes and found that the modified-NACA0024 with an inclination angle of 45° can provide the best heat transfer enhancement as much as 3 times over the plain tube as well as achieve the maximum heat transfer enhancement performance of 1.45 [23]. Figure 15 is illustrated the geometry of the modified-NACA0024 airfoil-shaped insert.…”

Section: Air Foil-shaped Insertmentioning

confidence: 99%

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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“…They achieved improvement in heat transfer by increasing the value of Re and decreasing the value of the twist ratio. The study of an airfoil shaped insert by Gururatana et al [8] revealed that the maximum TPF found was 1.45 when inserts were placed in 450. Aliabadi et al [9] investigated a set of arrangements of delta winglets.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis for Heat Transfer Augmentation in a Circular Tube Heat Exchanger Using a Triangular Perforated Y-Shaped Insert

Pandey

Singh

2021

Fluids

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The present investigation constitutes CFD analysis of the heat transmission phenomenon in a tube heat exchanger with a Y-shaped insert with triangular perforation. The analysis is accomplished by considering air as a working fluid with a Reynolds number ranging from 3000 to 21,000. The segment considered for analysis consists of a circular tube of 68 mm diameter and 1.5 m length. The geometrical parameter considered is the perforation index (0%, 10%, 20%, and 30%). The constant heat flux is provided at the tube wall and a pressure-based solver is used for the solution. The studies are performed for analyzing the effects of inserts on the heat transfer and friction factor in the circular tube heat exchanger which results in augmented heat transfer at a higher perforation index (PI) and lower friction factor. The investigation results show that the highest heat transfer is 5.84 times over a simple plain tube and the maximum thermal performance factor (TPF) is 3.25 at PI = 30%, Re = 3000.

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Experimental investigation of heat transfer in a tube heat exchanger with airfoil-shaped insert

Cited by 18 publications

References 14 publications

CFD analysis for thermo-hydraulic properties in a tubular heat exchanger using curved circular rings

CFD analysis for thermo-hydraulic properties in a tubular heat exchanger using curved circular rings

Review on Heat Transfer Enhancement by Insert Devices

Numerical Analysis for Heat Transfer Augmentation in a Circular Tube Heat Exchanger Using a Triangular Perforated Y-Shaped Insert

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