Modelling Condensation and Simulation for Wheat Germ Drying in Fluidized Bed Dryer

A low-temperature drying with fluidized bed dryer (FBD) for wheat germ (WG) stabilization could prevent the loss of nutrients during processing. However, both evaporation and condensation behaviors occurred in sequence during FBD drying of WG. The objective of this study was to develop a theoretical thin-layer model coupling with the macro-heat transfer model and the bubble model for simulating both the dehydration and condensation behaviors of WG during low-temperature drying in the FBD. The experimental data were also collected for the model modification. Changes in the moisture content of WG, the air temperature of FBD chamber, and the temperature of WG during drying with different heating approaches were significantly different. The thermal input of WG drying with short heating time approach was one-third of that of WG drying with a traditional heating approach. The mathematical model developed in this study could predict the changes of the moisture content of WG and provide a good understanding of the condensation phenomena of WG during FBD drying.

[1]  B. Thorat,et al.  Fluidized Bed Drying of Sprouted Wheat(Triticum aestivum) , 2013 .

[2]  Ke‐Xue Zhu,et al.  Antioxidant activities and total phenolic contents of various extracts from defatted wheat germ , 2011 .

[3]  V. Baskaran,et al.  Studies on heat stabilized wheat germ and its influence on rheological characteristics of dough , 2006 .

[4]  W.J.N. Fernando,et al.  EFFECT OF FLUIDIZED BED DRYING ON STABILIZATION OF RICE BRAN , 1993 .

[5]  V. K. Srivastava,et al.  Deep bed grain drying modeling , 2002 .

[6]  A. Brandolini,et al.  Wheat germ: not only a by-product , 2012, International journal of food sciences and nutrition.

[7]  P. Ribotta,et al.  Physical characterization and fluidization design parameters of wheat germ , 2017 .

[8]  E. Purlis.  Baking process design based on modelling and simulation: Towards optimization of bread baking , 2012 .

[9]  Sergio A. Giner,et al.  Evaluation of the thermal efficiency of wheat drying in fluidized beds: Influence of air temperature and heat recovery , 1988 .

[10]  N. S. Kincal,et al.  Use of a spouted bed to improve the storage stability of wheat germ followed in paper and polyethlyene packages , 2005 .

[11]  P. Ribotta,et al.  Optimization of soybean heat-treating using a fluidized bed dryer , 2013, Journal of Food Science and Technology.

[12]  K.S.M.S. Raghavarao,et al.  Studies on roasting of wheat using fluidized bed roaster , 2008 .

[13]  S. Renganarayanan,et al.  Studies on thin layer drying of bagasse , 2007 .

[14]  Yuanfa Liu,et al.  Inactivation of Lipase and Lipoxygenase of Wheat Germ with Temperature-Controlled Short Wave Infrared Radiation and Its Effect on Storage Stability and Quality of Wheat Germ Oil , 2016, PloS one.

[15]  H. Ramaswamy,et al.  Comparison of microwave, conventional and combination heat treatments on wheat germ lipase activity , 2007 .

[16]  C. Geankoplis,et al.  Transport processes and separation process principles : (includes unit operations) , 2003 .

[17]  Saeid Minaei,et al.  Computer simulation of rough rice drying in a batch dryer , 2006 .

[18]  P. Russo,et al.  Evolution of physicochemical properties of pear during drying by conventional techniques, portable-NMR, and modelling , 2018, Journal of Food Engineering.

[19]  Wen-ching Yang.  Handbook of Fluidization and Fluid-Particle Systems , 2003 .

[20]  D. S. Jayas,et al.  Simulation of Coupled Heat and Mass Transfer in Granular Porous Media: Application to the Drying of Wheat , 2011 .

[21]  刘艳霞,et al.  Thermal versus Microwave Inactivation Kinetics of Lipase and Lipoxygenase from Wheat Germ , 2016 .

[22]  Bin Xu,et al.  Thermal versus Microwave Inactivation Kinetics of Lipase and Lipoxygenase from Wheat Germ , 2016 .

[23]  Saeed Ziaei-Rad,et al.  Numerical simulation of rough rice drying in a deep-bed dryer using non-equilibrium model. , 2010 .

[24]  Sakhawat Ali,et al.  Nutritional evaluation and stabilization studies of wheat germ , 2013 .

[25]  Bin Xu,et al.  Study on the stabilization effect of continuous microwave on wheat germ , 2013 .

[26]  C. Srinivasakannan,et al.  An Analysis on Modeling of Fluidized Bed Drying of Granular Material , 2008 .

[27]  P. Jha,et al.  Lipase inactivation in wheat germ by gamma irradiation , 2013 .

[28]  Sergio A. Giner,et al.  Modelling of Wheat Drying in Fluidized Beds , 1987 .

[29]  A. Mahmoud,et al.  Wheat Germ: An Overview on Nutritional Value, Antioxidant Potential and Antibacterial Characteristics , 2015 .

[30]  M. A. Pagani,et al.  Wheat germ stabilization by heat-treatment or sourdough fermentation: Effects on dough rheology and bread properties , 2014 .

[31]  Hui He,et al.  Antioxidant Activities and Phenolic Compositions of Wheat Germ as Affected by the Roasting Process , 2015 .

[32]  P. Ribotta,et al.  Wheat germ thermal treatment in fluidised bed. Experimental study and mathematical modelling of the heat and mass transfer , 2018 .

[33]  P. Srinivasa Rao,et al.  A thin layer drying model of parboiled wheat , 2005 .

[34]  N. Jurković,et al.  Effect of thermal processing on the nutritive value of wheat germ protein. , 1993, Die Nahrung.