摘要:

In this paper, the usefulness of a mathematical model based on equations describing the diffusional phenomena which are variable with time, is developed and discussed in relation to serve as a model for experimental data of drying of Thompson seedless grapes.

ISSN:0737-3937    

DOI:10.1080/07373938608916308

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Vibro-fluidized bed dryers are being extensively used in the industry to dry granular particles of wide particle size distribution. For drying applications of limited air inlet temperature and hard to dry granules--high diffusion resistance of moisture inside the qranules--baffles are normally provided in these dryers to increase the residence time of particles. The residence time distribution of granules in vibro-fluidized bed dryers is of high importance to successfully model such dryers. There has been some studies reported in the literature for average residence time of granules in vibro-fluidized beds without baffles, but there has been no work reported for average residence time in vibro-fluidized beds with baffles and residence time distribution for beds with or without baffles. Experimental runs were carried out in this study in the 0.93 m2 (10 ft2 ) pilot plant vibro-fluidized bed dryer with baffles to determine the residence time distribution of dry granules and granule height profile through the length of the dryer.

ISSN:0737-3937    

DOI:10.1080/07373938608916309

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This study deals with the modeling and the search for the optimum production capacity of a tunnel-dryer of the Californian type. The model is obtained from the heat and mass transfer balances at two levels, the product (fruits) level and inside the tunnel itself. The optimum condition is given by the maximum production capacity of a plum dryer satisfying the final product quality. This choice is determined by the fact that a large amount of fruit must be dried in a short time to have a minimum of loss. Recirculation of a proportion of the exhaust air improves the dryer efficiently in terms of energy.

ISSN:0737-3937    

DOI:10.1080/07373938608916310

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Collision of droplets; counter-current spray dryer; drying rate; heat transfer; nonphosphated detergent; spray drying

ISSN:0737-3937    

DOI:10.1080/07373938608916311

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The hygroscopic potential of freeze dried papaya in the form of powder and granules was studied for several temperatures (23,33 and 43PC) and relative humidities (49 to 90%). For such conditions the kinetics of water sorption was established. The results show the influence of the amount of water absorbed, the environmental relative humidity and temperature on water sorption rates for this type of product. An intriguing behavior was found far the rates of water sorption as influenced by the absolute temperature, and at the critical level of 60% relative humidity, this influence is very much reduced.

ISSN:0737-3937    

DOI:10.1080/07373938608916312

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The paper presents the results of an investiga- tion into thermoradiation drying and film formation of a two-component solution having substantially dif- ferent boiling temperatures of the components, and being applied to a substrate under the conditions of matching the spectral emissive characteristics of the radiator with the spectral thermoradiative properties of the object of drying. The film transmissivity is found to,increase with a decrease in the mass of the solution during drying.

ISSN:0737-3937    

DOI:10.1080/07373938608916313

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

This paper deals with the sublimation of large bodies, or “objects”, made up from a pure substance in a bubbling gas fluidized bed of considerably smaller particles, or “fines”. The influence of such parameters as the gas velocity, the bed temperature, the size and the adsorption capacity of the fines has been investigated.

ISSN:0737-3937    

DOI:10.1080/07373938608916314

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The effects of acoustic drying of rice in a fluidized bed were evaluated at frequencies of 12 kHz and 19 kHz and air temperatures of 20.5° C and 40° C. The intensity levels were 132 and 128 dB respectively, intensities that are considerably lower than the 145 dB and higher usually applied in drying experiments of this type. The results confirmed that the effectiveness of acoustic drying is more pronounced at the lower temperatures, a significant fact especially in drying heat sensitive materials. The rate of water removal increased when acoustical energy at either frequency was applied with room temperature air. Increase in drying rate was not obvious when acoustic energy was applied at 40° C at the intensity levels of these experiments.

ISSN:0737-3937    

DOI:10.1080/07373938608916315

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Results of the studies on physico-thermal properties of raw rice bran show that the bulk density of rice bran decreased from 284.69 to 238.81 kg/m3 with the increase of moisture content from 6.3 to 16.5 per cent (d.b.). About 74 per cent of the raw rice bran particles fall below the size of 0.30 mm only. The thermal conductivity and the specific heat of raw rice bran increased linearly from 0.065 to 0.102 Kcal/m hr0c and from 0.3685 to 0.490 Kcal/kg 0C respectively for the same increase in moisture content. The experimental data are always found to be good fit to the linear relationships developed between thermal conductivity and moisture content as well as specific heat and moisture content.

ISSN:0737-3937    

DOI:10.1080/07373938608916316

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

“Powder Technology” is a book of the opening lecture and 92 papers presented at The International Symposium on Powder Technology held at Kyoto International Conference Hall, Kyoto, Japan, September 28-October 1, 1981. This Symposium conmemorated the 25th anniversary of the Society of Powder Technology, Japan. There were approximately 280 researchers from Japan and over 50 from overseas representing the leading powder technologists in the world. After the opening lecture by Professor Iinoya, the papers were presented in eight technical sessions denoted by the key words and phrases given above.

ISSN:0737-3937    

DOI:10.1080/07373938608916317

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor