Arun S. Mujumdar

Fluidized bed drying

Arun Mujumdar — Sun, 28 Jan 2007 20:14:57 PST

Chapter

P. Y. McCormack — Sun, 28 Jan 2007 20:13:18 PST

Investigation of pulse combustion impingement to enhance paper drying

Z.H. Wu — Sun, 28 Jan 2007 20:11:10 PST

A Comparative Study of A Spray Dryer with Rotary Disc Atomizer and Pressure Nozzle Using Computational Fluid Dynamic Simulations

L. X. Huang — Sun, 28 Jan 2007 20:09:48 PST

A comparative study of a spray dryer with rotary disc atomizer and pressure nozzle using computational fluid dynamic simulations

L. X. Huang — Sun, 28 Jan 2007 20:06:39 PST

Effect of Various Pretreatments on the Quality of Vacuum-Fried Carrot Chips

Liu-ping Fan — Sun, 28 Jan 2007 20:04:21 PST

Carrot slices were subjected to the following four different pretreatments prior to vacuum frying: (1) blanching, (2) blanching and air drying, (3) blanching and osmotic dehydration, (4) blanching, osmotic dehydration, followed by freezing. The effects of these pretreatments on the physicochemical properties and fat distribution in vacuum-fried carrot chips were also investigated. There were significant differences in the total yield, amounts of carotenes, vitamin C, and the color values of carrot chips following different pretreatments (P < 0.05). Pretreatment significantly affected the water content, fat content, and water activity of carrot chips (P < 0.05), while there were no significant differences in the breaking force of carrot chips treated with different pretreatments (P > 0.05). Spearman correlation analysis showed a high positive correlation between the fat content of carrot chips and the initial water content of carrot slices. The fat distribution pattern depended on the initial water content and the structure of the material left by water evaporation.

R&D Needs and Opportunities in Pulse Combustion and Pulse Combustion Drying

Zhonghua Wu — Sun, 28 Jan 2007 20:01:19 PST

This short communication attempts to summarize briefly the authors' opinions on R&D needs and opportunities for basic as well as applied research in pulse combustion and pulse combustion drying. It is not all-inclusive. Only minimal citations are made to relevant literature as readers interested in pro-actively pursuing this area can locate it reasonably easily. The objective in presenting this verview is to encourage new researchers in this fascinating and challenging field.

Spray dryers: modeling and simulation

V. S. Birchal — Sun, 28 Jan 2007 19:16:27 PST

This work presents a simulation study of the spray dryer operation using the whole milk suspension as the emulsion to be dried. Two approaches are used to obtain a general description of this operation. The first approach comprises a population balance model, in which drops and particles make up the discrete phase and are distributed into temporal compartments following their residence time in the dryer. Air is the continuous and well-mixed phase. Mass and energy balances are developed for each phase, taking into account their interactions. Constitutive model equations to describe the drop swelling and drying mechanisms as well as the heat and mass transfer between particles and hot air are also analyzed. The set of algebraic-differential equations obtained in this approach is solved by DASSL numerical code. The second approach involves a three-dimensional model solved by a computational fluid dynamic (CFD) code. The continuous air phase follows the time-averaged Navier-Stokes equations coupled with the RNG turbulence model while particle equations are set up in the Lagrangian model using the stochastic method to predict the particle trajectories. Experiments carried out in a pilot spray dryer generate input data for both model approaches. Results are compared to lead to a better understanding of the spray dryer operation.