Drying characteristics of porous material immersed in a bed of hygroscopic porous particles fluidized under reduced pressure

Tatemoto, Yuji; Tsunekawa, Masaya; Yano, Shuji; Takeshita, Takenari; Noda, Katsuji

doi:10.1016/j.ces.2007.01.022

Cited by 9 publications

(4 citation statements)

References 27 publications

(29 reference statements)

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“…Certainly, the effect of water adsorption on the drying rate appears when particles having a strong adsorption ability (like silica gel beads) are used as the fluidizing particles. [18,26,27] It is thought that a higher thermal conductivity of the glass beads resulted in the higher drying rate. Figure 5 shows the changes in the MR with time at a chamber pressure of 12 kPa under different drying conditions.…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…The drying rate was higher when the silica gel beads were used as the fluidizing particles rather than the glass beads; i.e., the properties of the fluidizing particles affected the drying characteristics. [18] In our studies, the diameter of the fluidized bed is 65 mm. The drying characteristics are unchanged when the conditions surrounding the drying material are constant during drying.…”

Section: Introductionmentioning

confidence: 99%

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Drying Characteristics of Carrots Immersed in a Fluidized Bed of Fluidizing Particles Under Reduced Pressure

Tatemoto

Michikoshi

2014

Drying Technology

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The drying characteristics and properties (color and shrinkage) of carrots (as a representative agricultural product) were experimentally examined in a fluidized bed under reduced pressure. Dry hot air and superheated steam were used as the drying gases. Rice and carrot powders (0.125-0.355 mm in diameter) were used as the fluidizing particles, in addition to glass beads (0.12 mm in diameter).It was confirmed that the drying rate using a fluidized bed was much higher than without a fluidized bed (hot-air drying), regardless of the type of fluidizing particles used. Under reduced pressure, both with and without a fluidized bed, the drying rate was higher than that at atmospheric pressure using hot air. The drying rate was sufficiently high for fluidized-bed drying with superheated steam, though the drying rate was higher with hot air than with superheated steam. As the drying temperature increased, the volume ratio (befor/after drying) of the sample increased. At high drying temperatures (373 and 423 K in the present study), the color of the sample changed; in other words, a heat-induced change in the properties of the carrot was observed. At a low drying temperature (333 K in the present study), the drying method did not affect the color of the carrot; i.e., the color of the dried material was maintained even in a fluidized bed under reduced pressure when the drying rate was higher. INTRODUCTIONThe drying process affects the quality of a dried product. In particular, heat-sensitive materials such as food, agricultural products, and pharmaceuticals need to be kept at a low temperature while being dried. Vacuum and freeze dryers have been used for the low-temperature drying of such materials. However, these dryers have certain problems; a long drying time and a large amount of energy are required for drying. It is necessary to manufacture a dryer that has a low drying temperature, high drying rate, and high energy efficiency for drying heat-sensitive materials.

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Section: Mathematical Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drying Characteristics of Carrots Immersed in a Fluidized Bed of Fluidizing Particles Under Reduced Pressure

Tatemoto

Michikoshi

2014

Drying Technology

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“…High pressure will increase the boiling temperature, so it is generally only suitable for drying non-heat-sensitive materials. Most heatsensitive materials, such as food, agricultural material, and other biomaterials, are dried under reduced pressure [1][2][3][4]14,15] or normal pressure. [6][7][8][9]11,12] Available reports are focused on experimental study, modeling, and simulation.…”

Section: Introductionmentioning

confidence: 99%

“…SSFBD is applicable at low pressure, [1][2][3][4] normal pressure, [5][6][7][8][9][10][11][12] and high pressure [13] according to different materials. High pressure will increase the boiling temperature, so it is generally only suitable for drying non-heat-sensitive materials.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Superheated Steam Fluidized Bed Drying: II. Experiments and Numerical Simulation

et al. 2011

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Based on the established axisymmetric two-dimensional superheated steam fluidized bed drying model, some required physical parameters and parametric models are measured and determined by experiments. The model can simulate the drying process and inhomogeneous spatial distribution of some thermodynamic and hydrodynamic parameters of rapeseed and superheated steam under normal pressure. The simulated drying dynamic curves are in agreement with the experimental curves. In the short condensing and heating period, a negative drying rate appears and rapeseed cannot be fully fluidized. The simulated and experimental results show that rapeseed is dried evenly without local overheating.

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Drying Vegetables: New Technology, Equipment, and Examples

Evranuz

2010

Handbook of Vegetables and Vegetable Processing

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Drying characteristics of porous material immersed in a bed of hygroscopic porous particles fluidized under reduced pressure

Cited by 9 publications

References 27 publications

Drying Characteristics of Carrots Immersed in a Fluidized Bed of Fluidizing Particles Under Reduced Pressure

Drying Characteristics of Carrots Immersed in a Fluidized Bed of Fluidizing Particles Under Reduced Pressure

Numerical Simulation on Superheated Steam Fluidized Bed Drying: II. Experiments and Numerical Simulation

Drying Vegetables: New Technology, Equipment, and Examples

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