Experimental and numerical study and comparison of performance for wavy fin and a plain fin with radiantly arranged winglets around each tube in fin-and-tube heat exchangers

Li, M.J.; Zhang, Hongti; Zhang, J.; Mu, Yingjie; Tian, En; Dan, D.; Zhang, X.D.; Tao, Wen‐Quan

doi:10.1016/j.applthermaleng.2018.01.012

Cited by 56 publications

(15 citation statements)

References 39 publications

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“…Numerous research on heat transfer characteristics of fins such as plain, wavy, offset fins and louvered fins over the flat wall has been studied and a considerable augmentation in heat transfer takes place. Li et al [11] studied the comparative performance for wavy fin and a plain fin with radiantly arranged winglets around each tube in fin and tube heat exchangers. Their results indicate that the heat transfer rate and pressure drop penalty of heat exchanger surfaces using wavy fin with five row tubes were almost same with six raw tubes wavy fin heat exchanger surfaces.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of wavy finned absorber solar air heater

Priyam¹,

Chand²

2018

IJHT

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This paper presents an experimental investigation on the thermal performance enhancement of solar air heater having wavy fins attached below the absorber plate. Tests were conducted to cover a wide range of parameters such as mass, velocity, fin spacing and insolation under actual outdoor conditions. The effect of these parameters on the thermal performance has been examined and the results have been compared with plane solar air heater. The maximum enhancement in thermal efficiency for wavy finned absorber solar air heater for fin spacing of 2 cm has been found to be 28.71% as compared to fin spacing of 6 cm and 116.67% as compared to plane solar air heater. The maximum value of ∆T/I for wavy fin spacing 2 cm, 6 cm and plane solar air heater has been achieved as 0.067, 0.048 and 0.029 m 2-°C/W respectively. Wavy finned absorber solar air heater has been found to be 67.44 to 121.43% thermally efficient as compared to plane solar air heater within the investigated range of system i.e. fin spacing of 2 to 6 cm and operating parameters i.e. mass velocity of 0.0065-0.033 kg/sm 2. A substantial enhancement in thermal efficiency was achieved in comparison to plane solar air heater and this improvement is a strong function of system and operating parameters.

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Section: Introductionmentioning

confidence: 99%

Thermal performance of wavy finned absorber solar air heater

Priyam¹,

Chand²

2018

IJHT

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“…Energies 2018, 11,1959 4 of 19 radii always exceeds those triangular fin patterns, especially at a higher Reynolds number; and a maximum 11.7% increment of JF factor can be achieved. Li et al [26] conducted a comparative study of fin-and-tube heat exchangers having wavy fin and a plain fin with radiantly arranged winglets. They showed that a plain fin surface incorporating longitudinal vortex generators with five tube rows are superior to the six rows wavy fin.…”

Section: Numerical Analysismentioning

confidence: 99%

Compound Heat Transfer Enhancement of Wavy Fin-and-Tube Heat Exchangers through Boundary Layer Restarting and Swirled Flow

et al. 2018

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This study performs a 3D turbulent flow numerical simulation to improve heat transfer characteristics of wavy finandtube heat exchangers. A compound design encompassing louver, flat, and vortex generator onto wavy fins can significantly enhance the heat transfer performance of wavy fin-and-tube heat exchangers. Replacement of wavy fins around tubes with flat fins is not effective as far as the reduction of thermal resistance is concerned, although an appreciable pressure drop reduction can be achieved. Adding two louvers with a width of 8 mm to the flat portion can reduce thermal resistance up to 6% in comparison with the reference wavy fin. Increasing the louver number and width can further decrease the thermal resistance. Also, it is found that the optimum louver angle is equal to the wavy angle for offering the lowest thermal resistance. Therefore, compound geometry with three louvers, a width of 12 mm, and the louver angle being equal to wavy angle with waffle height to be the same as fin pitch of the reference wavy fin has the most reduction in thermal resistance of 16% for a pumping power of 0.001 W. Adding punching longitudinal vortex generators on this compound geometry can further decrease thermal resistance up to 18%.

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“…The thermal performance of fins can be improved by a longitudinal vortex combined with low pressure loss. Vortex generators (VGs) are widely applied as the longitudinal vortex producer in heat exchangers and computational fluid dynamics is the most efficient method for the design and optimization of complex heat exchangers [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Meng et al [5] numerically analyzed the influence of multiple longitudinal vortices on thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

et al. 2020

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The effect of transverse pitch between a pair of delta-winglet vortex generators arranged in a common flow down configuration on the symmetrical flow structure and heat-transfer performance was numerically investigated. The results showed that symmetrical longitudinal vortices form a common flow down region between the vortices. The fluid is induced to flow from the top towards the bottom of the channel in the common flow region, which is advantageous to the heat transfer of the bottom fin. The vortex interaction increases and the vortex intensity decreases along with the decrease in transverse pitch of vortex generators. Vortex interaction has a slight influence on pressure penalty. The Nusselt number decreases with increasing vortex interaction. The vortices gradually attenuate and depart from each other during the process of flowing downward. A reasonable transverse pitch of delta-winglet vortex generators in a common-flow-down configuration is recommended for high thermal performance.

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Experimental and numerical study and comparison of performance for wavy fin and a plain fin with radiantly arranged winglets around each tube in fin-and-tube heat exchangers

Cited by 56 publications

References 39 publications

Thermal performance of wavy finned absorber solar air heater

Thermal performance of wavy finned absorber solar air heater

Compound Heat Transfer Enhancement of Wavy Fin-and-Tube Heat Exchangers through Boundary Layer Restarting and Swirled Flow

Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

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