DETERMINATION OF HEAT-TRANSFER COEFFICIENTS FOR CYLINDRICAL PRODUCTS EXPOSED TO FORCED-AIR COOLING

被引：3

作者：

DINCER, I ^{[1
]}

机构：

[1] TUBITAK MARMARA RES CTR,DEPT ENERGY SYST,GEBZE 41470,TURKEY

来源：

INTERNATIONAL JOURNAL OF ENERGY RESEARCH | 1995年 / 19卷 / 05期

关键词：

FORCED-AIR COOLING; PRECOOLING METHOD; GRAPE; TRANSIENT HEAT TRANSFER; HEAT TRANSFER COEFFICIENT; LUMPED CAPACITANCE METHOD; ANALYTICAL MODEL;

D O I：

10.1002/er.4440190510

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

An analytical model for estimation of transient heat transfer coefficients in forced-air precooling experiments of cylindrically shaped grapes, using a lumped capacitance approach were addressed and investigated. In order to determine transient heat transfer coefficients, the centre transient temperature measurements during forced-air precooling were used. Experiments involved cooling individual grapes in air flow without water losses. The individual grapes were instrumented with several interior thermocouples for measuring the centre transient temperature response during cooling. The transient values of the heat transfer coefficient history for five different air velocities were found to be about 21-40 W/m(2) K. These values were in good agreement with the values predicted using well-known Nusselt-Reynolds empirical correlation for forced convection. The present technique has the capability of determining transient heat transfer coefficients in a single transient experiment.

引用

页码：451 / 459

页数：9

共 14 条

[1]

Arce J., Sweat V.E., Survey of published heat transfer coefficient encountered in food refrigeration processes, ASHRAE Transactions, 86, pp. 235-260, (1980)

[2]

Ansari F.A., A simple and accurate method for measuring surface film conductance for spherical bodies, Int. Comm. Heat Mass Transfer, 14, pp. 229-236, (1987)

[3]

Handbook of fundamentals, (1981)

[4]

Dincer I., A simple model for estimation of the film coeffients during cooling of certain spherical foodstuffs with water, Int. Comm. Heat Mass Transfer, 18, pp. 431-443, (1991)

[5]

Dincer I., Determination of temperature distributions and heat transfer rates during precooling of spherical foodstuffs, Int. Comm. Heat Mass Transfer, 19, pp. 733-748, (1992)

[6]

Dincer I., Heat transfer rates during immersion cooling of spherical and cylindrical products, Int. Comm. Heat Mass Transfer, 20, pp. 445-456, (1993)

[7]

Dincer I., An exact heat transfer analysis of spherical products subjected to forced‐air cooling, Int. J. Energy Research, 17, pp. 9-18, (1993)

[8]

Dincer I., Heat‐transfer coefficients in hydrocooling of spherical and cylindrical food products, Energy — The International Journal, 18, pp. 335-340, (1993)

[9]

Holman J.P., Heat transfer, (1976)

[10]

Incropera F.A., de Witt D.P., Fundamentals of heat transfer, (1981)

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