Experimental study on heat transfer enhancement of wavy finned flat tubes by water spray cooling

Xiao, Liehui; Wu, Tao; Feng, Shuqin; Du, Xiaoze; Yang, Lijun

doi:10.1016/j.ijheatmasstransfer.2017.03.054

Cited by 23 publications

(11 citation statements)

References 29 publications

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“…They stated that the Nusselt numbers of discontinuous type, staggered type and vortex-generator type are increased by 11.29%, 28.61% and 56.46% on average, and the friction factors are increased by 3.23%, 66.26% and 48.58% on average, respectively. Xiao et al (2017) studied the augmentations on heat transfer and performance in a wavy finned flat tube by water spray cooling for Re = 210 -680. They claimed that the Nusselt numbers of three water flow rates are increased by 48 -68% on average when compared to the case without spray.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Jedsadaratanachai¹,

Boonloia²

2018

Frontiers in Heat and Mass Transfer

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Numerical analysis on flow configuration, heat transfer behavior and thermal performance in the heat exchanger tube equipped with various flow attack angles of the inclined wavy surface are presented. The laminar flow (Re = 100 -1200) and turbulent flow (Re = 3000 -10000) are considered for the present investigation. The flow attack angles of the inclined wavy surface are varied as 15 o -60 o . The finite volume method with SIMPLE algorithm is selected to evaluate the current problem. The numerical results are reported in terms of flow and heat transfer mechanisms. The performance evaluations in forms of the Nusselt number ratio (Nu/Nu 0 ), friction factor ratio (f/f 0 ) and thermal enhancement factor (TEF) are also concluded. As the results, the vortex flow, impinging flow and thermal boundary layer disturbance are detected when inserted the inclined wavy surface in the heat exchanger tube. These behaviors effect for the augmentation of the heat transfer rate, pressure loss and thermal performance. The optimum flow attack angle of the inclined wavy surface for the laminar and turbulent flows are also concluded.

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Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Jedsadaratanachai¹,

Boonloia²

2018

Frontiers in Heat and Mass Transfer

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“…The droplets can diffuse on the surface to form the thin liquid film, removing large quantities of heat not only due to the latent heat of evaporation but also the substantial convection effects (Horace et al (2005), Bostanci et al (2018)). In fact, spray cooling technology has been demonstrated to be an attractive method that is adopted for some high heat flux applications to take heat flux away from heat surfaces with low droplet impact speed, low surface superheat and heat removal uniformity (Hsieh ShouShing et al (2015), Karwa et al (2007), Kim et al (2007), Xiao et al (2017)). Recently, spray cooling researchers have paid more attention to improving the performance of heat transfer by using enhanced surfaces, and various studies have been conducted.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of spray cooling performance with enhanced heating surface structures

Wang

Jiang

2018

JTST

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An open loop spray cooling experimental system with ten enhanced groove surfaces was established. The results show that maintaining an unchanged groove width and changing the groove depth from 0.2 mm to 1.6 mm, the surface with a groove depth of 0.8 mm, the largest heat flux enhancement appears when volume flow rate is 0.45 L/min and 0.75 L/min. However, the heat transfer performance increased with an increasing groove depth under the flow rate of 1.25 L/min. Then based on the analysis of the forces acting on the falling droplet, the residual velocity of the droplet is calculated to explain why the optimal heat transfer of enhanced surfaces is different at different volume flow rates. Maintaining a groove depth of 0.8 mm, as the groove bottom width was reduced from 4 mm to 1 mm, the heat transfer coefficient increased by 41%. With the spray flow rate of 1.25 L/min, the heat transfer coefficient increased by only 8.5% and the reason for this phenomenon is explained by the variation of Bond number which reflects the capillary force. Finally, a relevant correlation of the non-dimensional Nusselt number Nu for the grooved surface is proposed in the non-boiling area with water coolant.

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“…They summarized that the thermal performance of the optimized cross-cut flow wavy fin is around 23.81% higher than the general wavy fin. Xiao et al (2017) experimentally examined the heat transfer increment in the wavy finned flat tube by water spray cooling. Khoshvaght-Aliabadi et al (2016) selected the passive method (perforation winglet) to improve the thermal efficiency of the wavy plate-fin heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Improvement in a Square Channel Heat Exchanger With Various Parameters of v-Wavy Plates

Jedsadaratanachai¹,

Boonloi²

2018

Frontiers in Heat and Mass Transfer

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Numerical examinations on flow and heat transfer behaviors in a square channel heat exchanger equipped with various configurations of V-wavy plate are performed. The pitch-to-channel height ratios, wavy height-to-channel height ratios and flow directions of the test section are investigated for the Reynolds number in the range of 100-1000 (laminar flow regime). The finite volume method is selected for the present investigation. The results are reported in terms of flow and heat transfer mechanisms in the channel. The thermal performance assessments of the square channel fitted with the V-wavy plate are also concluded. As the numerical results, the V-wavy plate can produce the swirling flow through the heating channel. The swirling flow disturbs the thermal boundary layer on the heat transfer surface that leads to enhance heat transfer rate and thermal efficiency.

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Experimental study on heat transfer enhancement of wavy finned flat tubes by water spray cooling

Cited by 23 publications

References 29 publications

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Numerical Predictions on Flow and Heat Transfer in Heat Exchanger Tube Equipped With Various Flow Attack Angles of Inclined-Wavy Surface

Experimental investigation of spray cooling performance with enhanced heating surface structures

Thermal Performance Improvement in a Square Channel Heat Exchanger With Various Parameters of v-Wavy Plates

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