3-D Numerical study on the correlation between variable inclined fin angles and thermal behavior in plate fin-tube heat exchanger

Şahi̇n, Hacı Mehmet; Dal, Ali Rıza; Baysal, Eşref

doi:10.1016/j.applthermaleng.2007.01.011

Cited by 28 publications

(11 citation statements)

References 16 publications

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“…Besides, the engineer is frequently interested in the pressure drop needed to sustain an internal flow because this parameter determines pump or fan power requirements. In this study, the values of the pressure drop can be negligible when compared with the heat transfer enhancement; it can be seen in the literatures as well .…”

Section: Resultsmentioning

confidence: 53%

“…Although some studies related to this area have been investigated only experimentally, some have been simulated only numerically . The most useful investigations are to compare both experimental and numerical studies.…”

Section: Introductionmentioning

confidence: 99%

“…The CFD code predicts some characteristics of the flow speeds, pressures, residence times, flow patterns, heat transfer, etc. Thus, numerical methods have been performed by several researchers for the analysis of heat exchangers included in several geometries and various boundary conditions . The heat transfer and flow friction behaviors in a circular tube with the helical turbulators have rarely been reported and studied with using the hot and cold water as the test fluids by Eiamsa‐ard and Promvonge .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation of thermal characteristics of a novel concentric type tube heat exchanger with turbulators

Şahi̇n

Baysal

Dal

2012

Int. J. Energy Res.

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SUMMARY In this study, the heat transfer performance and friction characteristics of a novel concentric tube heat exchanger with different pitches of helical turbulators were investigated experimentally and numerically for a Reynolds number range from 3000 to 14 000. An experimental system was established to obtain experimental data. The numerical simulations were performed by using a three dimensional numerical computation technique, a commercial CFD computer code. Then, the heat transfer performance and friction characteristics of several helical turbulators were compared. The experimental, numerical and empirical correlation results were in a good agreement with each others. As a result, the heat transfer enhancements using turbulators were 2.91, 2.41, 2.18 and 1.99 times better than the smooth tube for pitch distances of p = 20, 40, 60 and 80 mm, respectively. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation of thermal characteristics of a novel concentric type tube heat exchanger with turbulators

Şahi̇n

Baysal

Dal

2012

Int. J. Energy Res.

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“…The results indicated that the distance between the fins had a considerable effect on pressure drop and heat transfer by placing the fin-tube in the downstream region positively. Şahin et al [19] investigated the heat transfer and pressure drop of seven different fin angles (0°, 5°, 10°, 15°, 20°, 25°, 30°) with plain fin-tube heat exchangers using Fluent. The results showed that, the heat exchanger with the inclined fin angle of 30° exhibited the maximum heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…To optimize the structure of the fin and tube evaporator, several scholars analyzed the effect of the geometry of the fin and tube evaporator on heat transfer performance [17][18][19][20][21]. Tang et al [17] investigated the air-side performance of the fin-and-tube heat exchangers with five types of fin configurations through experimental and numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of an Evaporator for a Diesel Engine–Organic Rankine Cycle (ORC) Combined System and Influence of Pressure Drop on the Diesel Engine Operating Characteristics

et al. 2015

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Abstract:The main purpose of this research is to analyze the performance of an evaporator for the organic Rankine cycle (ORC) system and discuss the influence of the evaporator on the operating characteristics of diesel engine. A simulation model of fin-and-tube evaporator of the ORC system is established by using Fluent software. Then, the flow and heat transfer characteristics of the exhaust at the evaporator shell side are obtained, and then the performance of the fin-and-tube evaporator of the ORC system is analyzed based on the field synergy principle. The field synergy angle (β) is the intersection angle between the velocity vector and the temperature gradient. When the absolute values of velocity and temperature gradient are constant and β < 90°, heat transfer enhancement can be achieved with the decrease of the β. When the absolute values of velocity and temperature gradient are constant and β >90°, heat transfer enhancement can be achieved with the increase of the β. Subsequently, the influence of the evaporator of the ORC system on diesel engine OPEN ACCESSEnergies 2015, 8 5489 performance is studied. A simulation model of the diesel engine is built by using GT-Power software under various operating conditions, and the variation tendency of engine power, torque, and brake specific fuel consumption (BSFC) are obtained. The variation tendency of the power output and BSFC of diesel engine-ORC combined system are obtained when the evaporation pressure ranges from 1.0 MPa to 3.5 MPa. Results show that the field synergy effect for the areas among the tube bundles of the evaporator main body and the field synergy effect for the areas among the fins on the windward side are satisfactory. However, the field synergy effect in the areas among the fins on the leeward side is weak. As a result of the pressure drop caused by the evaporator of the ORC system, the diesel engine power and torque decreases slightly, whereas the BSFC increases slightly with the increase of exhaust back pressure. With the increase of engine speed, power loss, torque loss, and BSFC increment increase gradually, where the most significant change is less than 1%. Compared with the diesel engine itself, the maximum increase of power output of the diesel engine-ORC combined system is 6.5% and the maximum decrease of BSFC is 6.1%.

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An experimental and numerical investigation of air side heat transfer and flow characteristics on finned plate configuration

Ling

Peng

2012

Heat Mass Transfer

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3-D Numerical study on the correlation between variable inclined fin angles and thermal behavior in plate fin-tube heat exchanger

Cited by 28 publications

References 16 publications

Experimental and numerical investigation of thermal characteristics of a novel concentric type tube heat exchanger with turbulators

Experimental and numerical investigation of thermal characteristics of a novel concentric type tube heat exchanger with turbulators

Performance Analysis of an Evaporator for a Diesel Engine–Organic Rankine Cycle (ORC) Combined System and Influence of Pressure Drop on the Diesel Engine Operating Characteristics

An experimental and numerical investigation of air side heat transfer and flow characteristics on finned plate configuration

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