摘要:

Recent experimental data on aerodynamic and heat transfer characteristics of vibro-fluidized beds of model particles are presented and discussed in the light of the limited prior information. An analysis is presented for the bed dynamics with supporting experimental data. The predicted results for bed flight time, pressure drop and average voidage are shown to agree favorably with experimental data. On the basis of experimental results, a theoretical model and a simple design chart are presented which may be used to determine favorable operating ranges for a vibro-fluid bed apparatus.

ISSN:0737-3937    

DOI:10.1080/07373938408959848

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Thermodynamic functions computed for food systems showing hysteresis indicate considerable differences. There appears to exist no qualitative agreement between the values obtained. Large differences in values between the adsorption an desorp-tion branches of isotherms make the absolute magnitude of the entropy and enthalpy changes uncertain. The desorption iso-steric heat was found to decrease with temperature while the adsorption branch of the isotherm for a few foods were found to exhibit temperature reversal effect giving higher values at low temperatures. Such trend may indicate either transition in the form of binding energy or the effect of temperature on structural alterations. In designing drying equipment, the isosteric heat of desorption will provide “a worst case” analysis as the true isosteric heat will lie somewhere between the adsorption and desorption isosteric heat. Any overcalculation in designing equipment by using the desorption branch of hysteresis data can only be in favor of increased throughput capability. The use of isosteric heat in freeze drying and in air drying calculations were undertaken and found to rise at a faster rate than the energy expended in moisture removal.

ISSN:0737-3937    

DOI:10.1080/07373938408959849

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Data collected on corn drying bins employing unheated air and bins utilizing electric heat for small air temperature rises indicate better energy efficiency when the energy is used to provide more air as compared to using a portion of the energy to increase the temperature of a smaller quantity of air. Unheated air drying of shelled corn was accomplished with an average of about 6.0 kWh per metric ton per percentage point of moisture removed as compared to an average of about 12.0 kWh/t- % when electric heaters were used to increase the air temperature. Final corn moisture content was approximately the same for both methods since the unheated air drying systems, with more air per unit of grain, completed drying earlier. Early fall weather, as contrasted to late fall, is generally more favorable to drying and the existence of lower average daily relative humidities permit the drying of corn to 15% or less, wet basis, without the addition of heat.

ISSN:0737-3937    

DOI:10.1080/07373938408959850

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938408959851

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938408959852

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938408959853

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The goal of this study was to present the economic feasibility of biomass as a source of energy for corn drying. The market value of grain usually precludes it from being the most economical source of energy for grain drying, especially when compared to cobs and stover. If cobs and stover have little external value to the farm, and if they can be harvested economically, both can presently compete with LP gas as a source of energy for grain drying.

ISSN:0737-3937    

DOI:10.1080/07373938408959854

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938408959855

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938408959856

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938408959857

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor