Effect of wing-pitch ratio of double-sided delta-wing tape insert on the improvement of convective heat transfer

Wijayanta, Agung Tri; Yaningsih, Indri; Juwana, Wibawa Endra; Aziz, Muhammad; Miyazaki, Takahiko

doi:10.1016/j.ijthermalsci.2020.106261

Cited by 34 publications

(15 citation statements)

References 22 publications

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“…e best and worst values of each criterion are calculated using equation (32) and are depicted in Table 13, followed by the construction of utility measure relation, regret measure relation, and VIKOR index using equations ( 33)- (35) shown in Table 14. e ranking of the options is prioritized according to the VIKOR index value, as shown in Table 14 and Figure 17.…”

Section: Ranking the Alternativesmentioning

confidence: 99%

“…Hence, the optimization of grooved tube heat exchanger is essential for obtaining high performance with energy saving and pumping cost reduction [33,34]. Blade vortex generator inserts, multiple helical tape inserts, and diverging perforated cones are special types of inserts that are used as turbulators to reduce the flow blockage in downstream conditions and improve the Reynolds number [35]. Wijayanta et al [36] proposed that delta wing tape turbulators raise the heat transfer performance by 177% and their design configurations are optimized using the ANN method [37].…”

Section: Introductionmentioning

confidence: 99%

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Genetic Algorithm Integrated Fuzzy AHP-VIKOR Approach for the Investigation of W-Cut Insert Heat Exchanger for Cooling of Dielectric Fluid Used in Ultra-High Voltage Transformer

Gowri

Isaac

Muralikrishna

et al. 2022

Advances in Materials Science and Engineering

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This study proposes a novel W-cut twisted tape to evaluate and enhance the effectiveness of novel grooved tube heat exchanger. The experimental investigations are carried out with W-cut inserts, which possess two main control factors, namely, twist tape ratio (y = 3.5 to 6.5) and width tape ratio (WR = 0.43 to 0.6). The investigation results prove that in all cases the energy transmission and friction factor of W-cut insert along with the first law and second law efficiency are considerably higher than the conventional tube arrangement. The empirical model equations for friction factor, performance enhancement ratio, Nusselt number, and rational efficiency are developed, and they show good affinity with experimental data. Since the abovementioned factors have conflicting terms, it is essential to select the proper operating configuration of the heat exchanger in order to increase the thermal energy transfer rate with reduced consumption of pumping energy. The multi-objective genetic algorithm (GA) tool is used to identify the optimum operating conditions. Further, the hybrid multi-criteria decision-making model, FAHP-VIKOR, is applied to select the perfect model from the set of non-dominated solution. The ranking of alternatives is as follows: A4 > A11 > A2 > A9 > A21 > A17 > A1 > A24 > A11 > A23 > A7 > A18 > A13 > A10 > A20 > A5 > A19 > A14 > A16 > A22 > A25 > A6 > A15 > A3 > A8. The optimized configuration of W-cut insert is compared with the former inserts, and the optimal configuration exhibits supreme performance than other inserts.

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Section: Ranking the Alternativesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic Algorithm Integrated Fuzzy AHP-VIKOR Approach for the Investigation of W-Cut Insert Heat Exchanger for Cooling of Dielectric Fluid Used in Ultra-High Voltage Transformer

Gowri

Isaac

Muralikrishna

et al. 2022

Advances in Materials Science and Engineering

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“…Skullong [15] Pourhedayat et al, [16] Khoshvaght-Aliabadi et al, [19] Boonloi and Jedsadaratanachai [18] Gururatana et al, [17] Wijayanta et al, [20] Skullong et al, [1] Fig.…”

Section: Promvonge Andmentioning

confidence: 99%

Thermo-Hydraulic Performance of Heated Tube with Twisted Delta Winglet Swirler Insert: A Numerical Simulation

Amin

Azmi

Ismail

2022

ARFMTS

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Among the various methods for enhancing heat transfer in a heat exchanger, a passive method of inserting a continuous swirler inside a heated tube provides a secondary flow along the fluid that reduces the thickness of the thermal boundary layer, thus increasing the efficiency of convection heat transfer performance. The research’s primary goal is to conserve energy, materials, and money by operating efficient heat exchanger equipment. However, the continuous swirler along the fluid flow creates a persistent obstruction, which amplifies the friction factor and increases the working fluid’s energy loss. As a result, this research presented the twisted delta winglet swirler (TDWS), a new design of a decaying swirler that uses delta winglets twisted to 180° to produce a swirling flow along the tube. The swirler comprises four twisted delta winglets arranged in a circle with a diameter 6% smaller than the tube and a length of L/D=2.2. It was placed at the entrance to a heated tube test section with a diameter of 0.016 m and a length of L/D=93.75. The Reynolds Stress Model was used to simulate the flow domain with a water-ethylene glycol mixture was chosen as the working fluid. TDWS transformed the uniform inlet flow from potential energy to high kinetic energy, resulting in a high intensity of swirling flow downstream of the circular tube up to L/D=46.88 before decaying and reaching a steady state. Compared to other decaying swirlers, TDWS obtained one of the lowest relative friction factors, 1.36, with this flow. The maximum global relative Nusselt number increased by only 11% because this value considered the area where the flow reached a steady state. Since the TDWS is a decaying swirler, the thermal-hydraulic performance reached unity along the tube. However, the optimal performance of TDWS in the plain tube with a length of L/D=93.75 can be found if the dimension or geometric configuration of the TDWS is modified, or two or more TDWS may be placed in an array orientation.

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“…Figure 6 shows the copper tube with a sparsely placed twisted tape combined with multiple transverse twisted baffles. Wijayantaa et al, [15] illustrated the limited number of studies of heat transfer enhancement regarding the wingpitch ratio. To experiment in this field, they improved single-phase convective heat transfer with water as working fluid under a condition of 5,300 to 14,500 Reynolds number.…”

Section: A B Cmentioning

confidence: 99%

“…To experiment in this field, they improved single-phase convective heat transfer with water as working fluid under a condition of 5,300 to 14,500 Reynolds number. It is revealed from the study that the delta wing tape inserts with a wing-pitch ratio of 1.18 produces the greatest thermal performance factor of 1.15 and offers the highest average Nusselt number of 177% compared to a plain tube [15]. Figure 7(a) shows the geometry and Figure 7(b) illustrates the photograph of the delta wing tape inserts.…”

Section: A B Cmentioning

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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Effect of wing-pitch ratio of double-sided delta-wing tape insert on the improvement of convective heat transfer

Cited by 34 publications

References 22 publications

Genetic Algorithm Integrated Fuzzy AHP-VIKOR Approach for the Investigation of W-Cut Insert Heat Exchanger for Cooling of Dielectric Fluid Used in Ultra-High Voltage Transformer

Genetic Algorithm Integrated Fuzzy AHP-VIKOR Approach for the Investigation of W-Cut Insert Heat Exchanger for Cooling of Dielectric Fluid Used in Ultra-High Voltage Transformer

Thermo-Hydraulic Performance of Heated Tube with Twisted Delta Winglet Swirler Insert: A Numerical Simulation

Review on Heat Transfer Enhancement by Insert Devices

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