Heat and mass transfer model building in drying with multiresponse data (EN)

Marinos-Kouris, D (EN)

Kiranoudis, CT (EN)

Maroulis, ZB (EN)

A model building technique involving the investigation of experimental drying data that comprise responses of material moisture content and temperature is presented. It is based on an iterative procedure in which an initial process mathematical model is tested for inadequacies observed in distributions of residuals produced when predicted state variables are compared to experimental data. Model parameters are estimated by maximizing their posterior density propability distribution involving both responses simultaneously. Possible tendencies in residuals reveal inadequacies of the examined model to sufficiently describe heat and mass transfer mechanisms during drying. The significance and correlation of model parameters are studied by determining their joint confidence regions. Sensitivity analysis of model parameters related to the output state responses shows which transfer mechanism prevails in the region where tendencies are observed. This is then either suitably transformed so that lumped dependencies of model parameters are taken into consideration, or completely changed into another form that might describe transport phenomena in a more efficient way. This interative model modification is further continued until any tendency in these residuals is eliminated. The procedure adopted indicates that, in the case of vegetables, mass transfer is controlled by three mechanisms which become sequentially significant with the progress of drying: convection, followed by diffusion in the solid phase, and conversion of bound into free diffused water in the last stages of drying until equilibrium is reached. Heat transfer is controlled solely by external convection, while internal conduction remains negligible. © 1994. (EN)

journalArticle (EN)

Joint confidence regions (EN)

Transport properties (EN)

Model Building (EN)

Confidence Region (EN)

Heat conduction (EN)

Thermodynamics (EN)

Heat convection (EN)

Thermal effects (EN)

Mathematical models (EN)

Heat and Mass Transfer (EN)

Diffusion (EN)

Iterative methods (EN)

Sensitivity analysis (EN)

Mass Transfer (EN)

Sensitivity Analysis (EN)

Moisture (EN)

Probability (EN)

Engineering, Mechanical (EN)

Mass transfer (EN)

Experimental Data (EN)

Transport Phenomena (EN)

Mechanics (EN)

Heat Transfer (EN)

Mathematical Model (EN)

Moisture Content (EN)

Heat transfer (EN)

Drying (EN)

Εθνικό Μετσόβιο Πολυτεχνείο

Ψηφιακό Αποθετήριο της Κεντρικής Βιβλιοθήκης του ΕΜΠ | Dspace@NTUA

Κεντρική Βιβλιοθήκη Ε.Μ.Π.

Ιδρυματικό Αποθετήριο

Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά

International Journal of Heat and Mass Transfer (EN)

Αγγλική γλώσσα

1995 (EN)

http://hdl.handle.net/123456789/11546

463 (EN)

3 (EN)

38 (EN)

ISI:A1995QE11100008 (EN)

10.1016/0017-9310(94)00166-S (EN)

480 (EN)

0017-9310 (EN)

PERGAMON-ELSEVIER SCIENCE LTD (EN)