Field synergy principle for enhancing convective heat transfer––its extension and numerical verifications

Tao, Wen‐Quan; Guo, Zeng-Yuan; Wang, Bu‐Xuan

doi:10.1016/s0017-9310(02)00097-2

Cited by 325 publications

(93 citation statements)

References 5 publications

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“…The field synergy principle is different from the traditional heat transfer enhancement theory [29][30][31]. According to the field synergy principle, the convective heat transfer performance not only depends on the velocity of the fluid, the thermodynamic properties of the fluid, and the temperature difference between the fluid and solid wall, but also on the situation of synergy between the velocity field and the temperature gradient field.…”

Section: Results and Discussion Of The Evaporator Numerical Simulationmentioning

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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Section: Results and Discussion Of The Evaporator Numerical Simulationmentioning

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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“…The field synergy principle was presented by Guo et al [13] and Tao et al [14], and was validated on numerous heat transfer phenomena [15][16][17][18][19][20][21][22][23][24][25]. The field synergy principle suggests that the heat transfer rate could be optimized by coordinating the velocity field and temperature gradient for a certain situation.…”

Section: Introductionmentioning

confidence: 93%

Field Synergy Analysis and Optimization of the Thermal Behavior of Lithium Ion Battery Packs

Jia

Huo

et al. 2017

Energies

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Abstract:In this study, a three dimensional (3D) modeling has been built for a lithium ion battery pack using the field synergy principle to obtain a better thermal distribution. In the model, the thermal behavior of the battery pack was studied by reducing the maximum temperature, improving the temperature uniformity and considering the difference between the maximum and maximum temperature of the battery pack. The method is further verified by simulation results based on different environmental temperatures and discharge rates. The thermal behavior model demonstrates that the design and cooling policy of the battery pack is crucial for optimizing the air-outlet patterns of electric vehicle power cabins.

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“…The field synergy principle of boundary-layer flow has been systematically expounded by Guo and Tao et al [14,15]. It shows that the convective heat transfer not only depends on the thermal physics properties, the temperature difference and the fluid flow velocity, but also depends on the angle between the velocity vector and the temperature gradient.…”

Section: Field Synergy Analysismentioning

confidence: 99%

Field synergy analysis of six starts spiral corrugated tube under high Reynolds number

Jin

Liu

Qian

et al. 2016

J. Phys.: Conf. Ser.

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Abstract. Coaxial heat exchanger is widely used in air conditioning, refrigeration etc., due to its highly efficient heat transfer performance. Spiral corrugated tube plays an important role in coaxial heat exchanger. In this paper, the numerical model of a six starts spiral corrugated tube and a smooth tube with the same size are developed. The temperature field and the velocity field of their streamline and longitudinal vortex are investigated respectively. Then, their heat transfer and pressure drop performance inside the spiral corrugated tube under different high Reynolds number is investigated by compared their Nusselt number and friction coefficient. Meanwhile, their field synergy performances with their field synergy angles are presented. The result shows that the Nusselt number and friction coefficient of spiral corrugated tube are always larger than the smooth tube, and with the increasing of Reynolds number, the heat transfer performance of SCT becomes better than smooth tube, however, the friction coefficient ratio also increases synchronously. And in spiral corrugated tube, the field synergy angel is smaller than in the smooth tube. This work can be referred by some who are also dealing with spiral corrugated tube and its heat performance research.

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Field synergy principle for enhancing convective heat transfer––its extension and numerical verifications

Cited by 325 publications

References 5 publications

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

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

Field Synergy Analysis and Optimization of the Thermal Behavior of Lithium Ion Battery Packs

Field synergy analysis of six starts spiral corrugated tube under high Reynolds number

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