Investigating thermal performance of combined use of SiO2-water nanofluid and newly designed conical wire inserts

Oflaz, Fatma; Keklikçioğlu, Orhan; Özceyhan, Veysel

doi:10.1016/j.csite.2022.102378

Cited by 22 publications

(4 citation statements)

References 37 publications

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“…shaped turbulator [19], (k) wire coil turbulator [21], (l) wire coil turbulator [22], (m) circular-ring tabulators [20], (n) wavy strip turbulator [25], (o) spindle-shaped turbulators [23].…”

Section: Experimental Setup and Numerical Details 21 Configuration Of...mentioning

confidence: 99%

“…It was disclosed that at a pitch ratio of 0.83, the optimal thermal performance factor surpassed 1.72. Oflaz et al [22] examined the heat transfer of a tube containing conical wire turbulators placed at various distances. The conical wire inserts with a pitch ratio of 0.0 gave the highest heat transfer rate and the greatest thermal performance of 1.75.…”

Section: Introductionmentioning

confidence: 99%

“…Turbulators for heat transfer augmentation used in the previous studies. (a) circular ring-metal wire net [12], (b) helical surface disc [13], (c) horizontal perforated teardrop-shaped [24], (d) conical rings [14], (e) flow-divider-type turbulator [15], (f) conical turbulator [26], (g) zigzagshaped turbulators [16], (h) digit NACA airfoil turbulator [17], (i) cut square turbulator [18], (j) semicircular-shaped turbulator [19], (k) wire coil turbulator [21], (l) wire coil turbulator [22], (m) circular-ring tabulators [20], (n) wavy strip turbulator [25], (o) spindle-shaped turbulators [23].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Heat Transfer of a Heat Exchanger Tube Installed with V-Shaped Delta-Wing Baffle Turbulators

Samruaisin,

Maza,

Thianpong

et al. 2023

Energies

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The influences of V-shaped delta-wing baffles on the thermohydraulic performance characteristics in a round tube were experimentally tested. The V-shaped delta-wing baffles having a set number of wings (N = 4, 6, and 8) were comparatively tested. The V-shaped delta-wing baffles with various pitch ratios of P/D = 2.0, 2.5, and 3.0 were thoroughly fitted inside a tube. In the present work, the baffles were responsible for both the recirculation/reverse flow behind the solid baffle and the longitudinal vortex flow behind the V-shaped wing. The V-shaped winged baffles with N = 8 produced high heat transfer rates by promoting the development of reverse and vortex flows. These currents aid in fluid mixing between the two streams. Experimental results suggested that utilizing V-shaped delta-wing baffles having N = 4, 6, and 8 led to Nusselt number enhancement of up to 97–105.6%, 105.8–127.8% and 114.8–138.9%, respectively. When N was 8, the V-shaped wings baffles created additional multi vortex flows, which resulted in some fluid mixing between the vortex and the reverse flow. It was discovered that a greater turbulent intensity is imparted to the flow that was occurring between the V-shaped delta-wing baffles, which led to an increase in the rate of heat transfer when the pitch ratio was decreased. The increase in Nusselt number was up to 118.26–151.3% more than it was in a tube with the lowest pitch ratio (P/D = 2.0). It was also found that the baffles with N = 8 wings and P/D = 3.0 offered a maximum aerothermal performance factor (APF) of 1.01. Furthermore, the V-shaped delta-wing baffles have the potential for energy savings at low Re ≤ 6000, indicated by the APF beyond unity.

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Section: Experimental Setup and Numerical Details 21 Configuration Of...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Heat Transfer of a Heat Exchanger Tube Installed with V-Shaped Delta-Wing Baffle Turbulators

Samruaisin,

Maza,

Thianpong

et al. 2023

Energies

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“…Oflaz et al 21 studied spiral wire insert in a tube covering five distances stretching from 0 to 33.6 mm with SiO 2 –water nanofluids with four different volume concentrations (ranging from 0.5% to 1.25%) as the working fluid. Using nanofluids led to a substantial enhancement in HT as the Re increased, specifically at high‐volume concentrations.…”

Section: Introductionmentioning

confidence: 99%

The influence of geometrical and operational parameters on thermofluid performance of discontinuous colonial self‐swirl‐inducing baffle plate in a tubular heat exchanger

Rahman

2023

Heat Trans

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An exploratory investigation was conducted to analyze a tubular heat exchanger's turbulent heat transfer characteristics using an innovative baffle plate design. The design incorporated a perforated conical baffle plate and an adjustable rectangular deflector. The strategic placement of this baffle plate at the heat exchanger inlet facilitated a swirling flow downstream. To assess the impact of this design, three baffle plates with varying pitch ratios (l/D) were positioned in the direction of the flow. The study examined the effects of pitch ratio (ranging from 0.6 to 1.2), deflector inclination angle (ranging from 30° to 50°), and Reynolds numbers (ranging from 16,500 to 29,500). Moreover, the size of the conical baffle plate (H/D) was altered (from 0.25 to 0.15). The findings highlighted the substantial influence of pitch ratio, inclination angle, and height ratio on the heat exchanger's performance. Notably, the configuration featuring an inclination angle of 50° and height ratio of 0.15 exhibited an average performance improvement of 22% compared to other height ratios, inclination angles, and pitch ratios.

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Investigating heat exchanger tube performance: second law efficiency analysis of a novel combination of two heat transfer enhancement techniques

Mertaslan,

Keklikcioglu

2024

J Therm Anal Calorim

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In the study, the focus was on evaluating the second law efficiency of a heat exchanger tube operating under continuous heat flux and turbulent flow conditions. The evaluation involved the use of a hybrid GnP and Fe3O4 and modified coiled wire as passive heat transfer enhancement techniques. The primary objective was to investigate the impact of these combined techniques on thermal and hydraulic performance, entropy generation number, Bejan number and second law efficiency. To achieve this, different mass fractions of GnP and Fe3O4 nanoparticles were used in the hybrid nanofluid, along with two forms of modified coiled wire: barrel type and hourglass type. The experimental results indicated that the utilization of hybrid nanofluids and modified helical inserts led to a noticeable improvement in the second law efficiency of the heat exchanger tube. However, it was observed that the differences in entropy generation number and Bejan number between the barrel and hourglass types were not significant, mainly due to higher frictional losses associated with the latter. The highest recorded second law efficiency was 0.416, while the lowest entropy generation number was 0.118. These values were achieved through the combined use of GnP and Fe3O4 with a mass fraction of 0.4% and a barrel-type coiled wire insert with a pitch ratio of 0.5.

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Investigating thermal performance of combined use of SiO2-water nanofluid and newly designed conical wire inserts

Cited by 22 publications

References 37 publications

Enhanced Heat Transfer of a Heat Exchanger Tube Installed with V-Shaped Delta-Wing Baffle Turbulators

Enhanced Heat Transfer of a Heat Exchanger Tube Installed with V-Shaped Delta-Wing Baffle Turbulators

The influence of geometrical and operational parameters on thermofluid performance of discontinuous colonial self‐swirl‐inducing baffle plate in a tubular heat exchanger

Investigating heat exchanger tube performance: second law efficiency analysis of a novel combination of two heat transfer enhancement techniques

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