• Title/Summary/Keyword: Fin base height

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Analysis and Optimization based on the Fixed Fin Base Height for a Triangular Fin (삼각 핀의 해석과 고정된 핀 바닥 높이에 기준한 최적화)

  • Kang, Hyung-Suk
    • New & Renewable Energy
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    • v.3 no.1 s.9
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    • pp.13-19
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    • 2007
  • A triangular fin with variable fin base thickness and base height is analyzed and optimized for the fixed fin base height using a two-dimensional analytical method. At the middle of the fin length, the variation of the temperature along the fin height is listed. The influences of the fin length, base thickness and base height on the heat loss and fin efficiency are analyzed, The optimum heat loss, corresponding optimum efficiency and optimum fin length as a function of the fin base thickness are presented. The optimum heat loss and optimum fin tip length as a function of the convection characteristic number are represented.

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Optimum Design of a Geometrically Asymmetric Trapezoidal Fin Based on the Fixed Fin Base Height (고정된 핀 바닥 높이에 기준한 기하학적 비대칭 사다리꼴 핀의 최적 설계)

  • Kang, Hyung-Suk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.6
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    • pp.81-87
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    • 2008
  • A geometrically asymmetric trapezoidal fin with variable fin base thickness and height is optimized based on the fixed fin base height using a one-dimensional analytic method. The temperature profile along the normalized X position in the fin is presented. For the fixed fin base height, the optimum heat loss, fin length and efficiency as a function of inside fluid convection characteristic number, fin base thickness and height, fin shape factor, convection characteristic numbers ratio and ambient convection characteristic number are represented. One of the results shows that the effect of fin base height and ambient convection characteristic number on the optimum values is remarkable.

Comparative analysis of sectioned-body morphometric characteristics of diploid and triploid marine medaka, Oryzias dancena

  • Park, In-Seok
    • Korean Journal of Environmental Biology
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    • v.38 no.1
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    • pp.137-145
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    • 2020
  • The sectioned-body morphometric characteristics of the diploid and triploid marine medaka, Oryzias dancena, of both sexes were examined to collect basic data on the significant differences between the diploid and triploid fish. Significant differences between the diploid and triploid fish in both sexes were observed in the body circumference anterior to the base of the pelvic fin, the body circumference anterior to the base of the anal fin, the body circumference anterior to the base of the dorsal fin, the area anterior to the base of the pelvic fin, the area anterior to the base of the anal fin, the area anterior to the base of the dorsal fin, the total height anterior to the base of the pelvic fin, the total height anterior to the base of the anal fin, the height anterior to the base of the pelvic fin, the height anterior to the base of the anal fin, the width anterior to the base of the anal fin, the belly thickness II anterior to the base of the anal fin, section shape 2-1, and section shape 4-1 (p<0.05). These measurements were greater in the triploid marine medaka of both sexes than those in the diploid marine medaka of both sexes, and they were also greater in the male diploid and triploid marine medaka than those in the corresponding female fish. Therefore, the sectioned-body morphometric dimensions were greater in the triploid males than those in the triploid females and the diploid fish in this study.

Comparison of Performance between Symmetric Trapezoidal Fins and Asymmetric Trapezoidal Fins (대칭 사다리꼴 핀과 비대칭 사다리꼴 핀의 성능 비교)

  • Kang, Hyungsuk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.2
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    • pp.205-213
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    • 2016
  • Heat loss and fin efficiency of symmetric and asymmetric trapezoidal fins with variable slope of fin's top surface are obtained by using a two-dimensional analytic method. Shapes of symmetric and asymmetric fins are changed from rectangular through trapezoidal to triangular by adjusting the fin shape factor. The ratio of symmetric trapezoidal fin length to asymmetric trapezoidal fin length is presented as a function of fin base height and convection characteristic number. The ratio of symmetric trapezoidal fin efficiency to asymmetric trapezoidal fin efficiency is presented as a function of the fin base height and fin shape factor. One of results shows that asymmetric trapezoidal fin length is shorter than symmetric trapezoidal fin length (i.e., asymmetric trapezoidal fin volume is smaller than symmetric trapezoidal fin volume) for the same heat loss when the fin base height and fin shape factor are the same.

Analysis of a Geometrically Asymmetric Trapezoidal Fin with Variable Fin Base Thickness and Height

  • Kang, Hyung-Suk
    • International Journal of Air-Conditioning and Refrigeration
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    • v.16 no.3
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    • pp.83-88
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    • 2008
  • A geometrically asymmetric trapezoidal fin is analyzed using the one-dimensional analytic method. Heat loss and thermal resistance are represented as a function of the fin base thickness, base height, fm shape factor, inside fluid convection characteristic number, convection characteristic numbers ratio, fm length and ambient convection characteristic number. The relationship between the fin base height and the shape factor for equal amounts of heat loss is presented. One of the results shows that the variations of the fm base thickness and the inside fluid convection characteristic number give no effect on the thermal resistance.

ANALYSIS OF A REVERSED TRAPEZOIDAL FIN USING A 2-D ANALYTIC METHOD

  • Kang, H.S.
    • Journal of the Korean Society for Industrial and Applied Mathematics
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    • v.14 no.3
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    • pp.151-161
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    • 2010
  • A reversed trapezoidal fin is analyzed using a two-dimensional analytical method. Heat loss from the reversed trapezoidal fin is presented as a function of the fin shape factor, fin base thickness and the fin base height. The relationship between the fin tip length and the convection characteristic number as well as that between the fin tip length and the fin base height for equal amounts of heat loss are analyzed. Also the relationship between the fin base thickness and the fin shape factor for equal amount of heat loss is presented. One of the results shows that the heat loss decreases linearly with the increase of the fin shape factor.

Optimization of an Asymmetric Trapezoidal Fin Based on the Fixed Fin Base Height (고정된 핀 바닥 높이에 기준한 비대칭 사다리꼴 핀의 최적화)

  • Song, Nyeon-Joo;Kang, Hyung-Suk
    • Journal of the Korean Society of Propulsion Engineers
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    • v.16 no.1
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    • pp.45-54
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    • 2012
  • Optimization of the asymmetric trapezoidal fin with various upper lateral surface slope is made using a two-dimensional analytic method. For the fixed fin base height, the optimum heat loss, fin length and effectiveness are represented as inner fluid convection characteristic number, fin base thickness, fin base height, fin shape factor and ambient convection characteristic number. For this optimum procedure, the optimum heat loss is defined as 95% of the maximum heat loss from the fin. One of the results shows that optimum heat loss and effectiveness seems independent of the fin shape factor while optimum fin length decreases almost linearly as the fin shape factor increases.

The Effect of Inside and Outside Fluids on the Optimization of a Reversed Trapezoidal Fin (역 사다리꼴 핀의 최적화에 미치는 내 외 유체의 영향)

  • Kang, Hyung-Suk
    • Journal of the Korean Society of Propulsion Engineers
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    • v.11 no.5
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    • pp.14-22
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    • 2007
  • A reversed trapezoidal fin with variable lateral surface slope is optimized using a two-dimensional analytic method. For a fin base boundary condition, convection from the inside fluid to the inside wall and conduction from the inside wall to the fin base are considered. Heat loss from the fin tip surface is not ignored. The maximum heat loss at the practical fin length, the corresponding optimum fin efficiency, fin length and fin base height are presented as a function of the fin inside and outside convection characteristic numbers. One of the results shows that the optimum fin shape becomes 'fatter and shorter' as the ratio of fin tip height to base height increases.

Performance Analysis of a Geometrically Asymmetric Trapezoidal Fin for an Enhanced Heat Exchanger (향상된 열교환기를 위한 기하학적 비대칭 사다리꼴 핀의 성능 해석)

  • Song, Nyeon-Joo;Kang, Hyung-Suk
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.4
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    • pp.24-31
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    • 2011
  • Performance of the asymmetric trapezoidal fin with various upper lateral surface slopes is investigated by using the two-dimensional analytic method. For a fin base boundary condition, convection from the inner fluid to the inner wall, conduction from the inner wall to the fin base and conduction through the fin base are considered. Heat loss and fin efficiency are represented as a function of the fin base thickness, base height, inner fluid convection characteristic number, fin tip length and fin shape factor. One of the results shows that heat loss increases while fin efficiency decreases as the fin shape factor increases.

Optimum Design of a Reversed Trapezoidal Fin with Variable Fin Base Thickness (핀 바닥 두께가 변화하는 역 사다리꼴 핀의 최적 설계)

  • Kang, Hyung-Suk
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.20 no.7
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    • pp.455-461
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    • 2008
  • A reversed trapezoidal fin with variable fin base thickness is optimized using a two-dimensional analytical method. For the fin base boundary condition, instead of a constant temperature, heat transfer from the inside fluid to the fin base is considered. Heat loss from the fin tip is not ignored. The maximum heat loss, corresponding optimum fin effectiveness, fin length and base height are presented as a function of the fin base thickness, shape factor and volume.