A Linear Driving Force (LDF) Approximation of Moisture Diffusion Kinetics in White Rice
-
Soaking characteristics of white rice grain in water are studied at 25, 40, 60, 70 and 80 °C. The kinetics of mass transfer are modeled using a linear driving force (LDF) approximation with constant diffusivity, which is capable of predicting the moisture ratio profile with time. This approximation is a relatively new approach in food engineering applications for systems in which the rate of mass transfer is controlled by intra-particle diffusion and nonlinear adsorption through porous adsorbent. The mass transfer is also modeled through Fick's law for unsteady-state diffusion using finite difference (FD) method, and compared with the LDF model. In general, the moisture uptake curves calculated with this new approximation compare favorably with the finite difference solution obtained in spherical coordinates, producing results of similar accuracy. Both the methods give a good agreement with the experimental data. The values of the effective diffusion coefficients are between 7.33×10-11 m2/s and 1.43×10-10 m2/s for a temperature of 25 and 80 °C respectively. Although gelatinization of starch is observed at a higher temperature which influences the increase in moisture content, the moisture uptake curves calculated with this new approximation compare favorably with the numerical solution of the non-linear diffusion equation. As such, it can be safely used to predict the unsteady-state moisture absorption kinetics of a rice grain, for the temperature range investigated.
©2011 Walter de Gruyter GmbH & Co. KG, Berlin/Boston
Artikel in diesem Heft
- Article
- Drying Kinetics of Osmotically Pre-Treated Plum Tomato Pieces
- A Linear Driving Force (LDF) Approximation of Moisture Diffusion Kinetics in White Rice
- Effects of Different Coagulation Temperatures on the Texture and Yield of Soy Paneer (Tofu)
- Study on Immobilization Methods of Acetylcholinesterase
- Osmo-Convective Dehydration of Plum (Prunus salicina L)
- The Transfer of Ingested Plant and Enterobacterial Gene Fragments into Mice Bodies and Their Shift to the Livers of Suckling Mice Through Mother's Milk
- The Effects of Varieties and Moisture Content on Some Physical and Aerodynamic Properties of Sesame Seeds (Sesamum indicum L) as Related to Cleaning
- Mathematical Modeling of Thin Layer Drying Kinetics of Apple in Tunnel Dryer
- The Effect of Additives on Vacuum Dried Honey Powder Properties
- The Purification, Formulation and Drying of Papain
- Antioxidant Activity of the Flower of Nyctanthes arbor tristis L.
- Milk Cholesterol Reduction Using Immobilized Lactobacillus acidophilus ATCC1643 in Sodium-Alginate
- Recovery of Phytochemicals from Kokum (Garcinia indica choisy) Using Pressurized Hot Water
- The Drying Constant and its Effect on the Shrinkage Constant of Different-Shaped Food Particulates
- Shorter Communication
- Effectiveness of Antioxidant Properties of Fresh and Dry Rhizomes of Curcuma longa (Long and Short Varieties) with Dry Turmeric Spice
Artikel in diesem Heft
- Article
- Drying Kinetics of Osmotically Pre-Treated Plum Tomato Pieces
- A Linear Driving Force (LDF) Approximation of Moisture Diffusion Kinetics in White Rice
- Effects of Different Coagulation Temperatures on the Texture and Yield of Soy Paneer (Tofu)
- Study on Immobilization Methods of Acetylcholinesterase
- Osmo-Convective Dehydration of Plum (Prunus salicina L)
- The Transfer of Ingested Plant and Enterobacterial Gene Fragments into Mice Bodies and Their Shift to the Livers of Suckling Mice Through Mother's Milk
- The Effects of Varieties and Moisture Content on Some Physical and Aerodynamic Properties of Sesame Seeds (Sesamum indicum L) as Related to Cleaning
- Mathematical Modeling of Thin Layer Drying Kinetics of Apple in Tunnel Dryer
- The Effect of Additives on Vacuum Dried Honey Powder Properties
- The Purification, Formulation and Drying of Papain
- Antioxidant Activity of the Flower of Nyctanthes arbor tristis L.
- Milk Cholesterol Reduction Using Immobilized Lactobacillus acidophilus ATCC1643 in Sodium-Alginate
- Recovery of Phytochemicals from Kokum (Garcinia indica choisy) Using Pressurized Hot Water
- The Drying Constant and its Effect on the Shrinkage Constant of Different-Shaped Food Particulates
- Shorter Communication
- Effectiveness of Antioxidant Properties of Fresh and Dry Rhizomes of Curcuma longa (Long and Short Varieties) with Dry Turmeric Spice
