Advanced Cooling Systems for Agricultural and Industrial Machines

Bergles, A. E.; Junkhan, G. H.; Jensen, Michael K.; Hagge, John

doi:10.4271/751183

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…The dimensionless variables and parameters of equations (2a)-(2c) were also used for the parallel plate channel, and the governing differential equations are identical to equations (3)(4)(5). If note is taken of the symmetry which exists about the centerline of each channel, then the boundary conditions may be written as…”

Section: Discussionmentioning

confidence: 99%

“…In general, the heat transfer enhancement is accomplished by the modification of the pattern of fluid flow, so that the increased heat transfer capability is generally accompanied by a penalty in pressure drop and/or pumping power. A rational basis for assessing the benefits of the enhancement, taking account of pressure drop and pumping power considerations, has recently been developed [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Natural Convection Heat Transfer by a Staggered Array of Discrete Vertical Plates

Sparrow

Prakash

1980

Journal of Heat Transfer

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An analysis has been performed to determine whether, in natural convection, a staggered array of discrete vertical plates yields enhanced heat transfer compared with an array of continuous parallel vertical plates having the same surface area. The heat transfer results were obtained by numerically solving the equations of mass, momentum, and energy for the two types of configurations. It was found that the use of discrete plates gives rise to heat transfer enhancement when the parameter {Dh/H)Ra > ~2 X 10 3 (Dh -hydraulic diameter of flow passage, H = overall system height). The extent of the enhancement is increased by use of numerous shorter plates, by larger transverse interplate spacing, and by relatively short system heights. For the parameter ranges investigated, the maximum heat transfer enhancement, relative to the parallel plate case, was a factor of two. The general degree of enhancement compares favorably with that which has been obtained in forced convection systems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of Natural Convection Heat Transfer by a Staggered Array of Discrete Vertical Plates

Sparrow

Prakash

1980

Journal of Heat Transfer

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“…It has been demonstrated by Bergles and co-workers [4][5][6] that the advantage or disadvantage of one system relative to another depends on the goals to be achieved and the constraints of the comparison. Possible goals may include, for example, increasing the heat transfer rate or reducing the pumping power or reducing the size of the heat exchanger.…”

Section: Introductionmentioning

confidence: 98%

Experiments on In-line Pin Fin Arrays and Performance Comparisons with Staggered Arrays

Sparrow

Ramsey

Altemani

1980

Journal of Heat Transfer

144

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Heat transfer and pressure drop experiments were performed for in-line pin fin arrays to obtain basic data to complement available information for staggered arrays. The experimental data were utilized as input to analyses aimed at establishing performance relationships between in-line and staggered arrays. In the experiments, mass transfer measurements via the naphthalene sublimation technique were employed to determine the row-by-row distribution of the heat (mass) transfer coefficient. Fully developed conditions prevailed for the fourth row and beyond. In general, the fully developed heat transfer coefficients for the in-line array are lower than those for the staggered array, but the pressure drop is also lower. The deviations between the two arrays increase with increasing fin height. With regard to performance, the in-line array transfers more heat than the staggered array under conditions of equal pumping power and equal heat transfer area. On the other hand, at a fixed heat load and fixed mass flow rate, the staggered array requires less heat transfer surface than the in-line array.

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“…2Test surface details address this problem, several techniques have been proposed, such as those by Bergles et d (8). and Cowell(9).…”

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confidence: 99%

Thermal and Friction Factor Data for Three Packed Block Construction Wavy Fin Surfaces

BEng¹,

Al‐Shemmeri

1994

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper describes an experimental work undertaken to determine performance data for packed block wavy j n s . A purpose-built heat exchanger testing wind tunnel was used to investigate three wavy surfaces. The data were then presented in the form of Colburn 0') factors and friction ( f ) factors versus Reynolds number. Results showed a favourable comparison with published works pertaining to similar surface geometries; in addition, geometries were also tested which varied considerably from those in the literature to date. NOTATIONair side heat-transfer area (m') air side minimum free flow area (m') air side face area (m') air specific heat capacity (J/kg K) pressure drop (N/m2) average air density (kg/m3) air density at inlet (kg/m3) air density at outlet (kg/m3) air volume flowrate at inlet (m3/s) friction factor mass velocity = FDJA, (kg/m2 s) air side film heat-transfer coefficient (W/m2 K) Colburnj factor air thermal conductivity (W/mK) contraction pressure loss factor expansion pressure loss factor air side flow length (m) Nusselt number = 4rhh/k Prandtl number = C , p / k air side hydraulic radius = A , L / A (m) Reynolds number = 4rhG/p relative humidity (%) temperature ("C) dynamic viscosity (kg/ms) heat exchanger porosity = AJA,,

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Advanced Cooling Systems for Agricultural and Industrial Machines

Cited by 7 publications

References 20 publications

Enhancement of Natural Convection Heat Transfer by a Staggered Array of Discrete Vertical Plates

Enhancement of Natural Convection Heat Transfer by a Staggered Array of Discrete Vertical Plates

Experiments on In-line Pin Fin Arrays and Performance Comparisons with Staggered Arrays

Thermal and Friction Factor Data for Three Packed Block Construction Wavy Fin Surfaces

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