大师作文网ConclusionA laboratory scale microwave freeze drying apparat
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Conclusion
A laboratory scale microwave freeze drying apparatus was
developed aimed at experimentally verifying the beneficial
effect of a dielectric material on freeze drying with microwave
heating.Sintered SiC was used as the dielectric material.
Mannitol,a typical pharmaceutical excipient,was
selected as the solute in aqueous solution.The experimental
results show that the use of the dielectric material in microwave
freeze drying can effectively enhance the freeze drying
rate.More than 20% of drying time was saved compared
with conventional freeze drying under the operating conditions
tested.A porous media mathematical model of freeze
drying with hygroscopic effect was derived and solved
numerically using the finite difference method with a moving
boundary.The hygroscopic effect was quantified based on a
modified adsorption–desorption relationship.For mannitol,
the ratio of vapor pressures between the adsorption–desorption
equilibrium and the thermodynamic equilibrium follows
the square root of the moisture saturation.Comparisons of
drying curves between experimental data and theoretical predictions
displayed good agreements.Simulation results also
show that when the solid content of the solution to be freeze
dried is very low or the solid product has a very small loss
factor,microwave heating is less effective unless dielectric
materials are employed.Drying rate controlling factor was
analyzed to be mass transfer in the primary drying stage and
heat transfer in the secondary drying stage.
翻译上面一段
A laboratory scale microwave freeze drying apparatus was
developed aimed at experimentally verifying the beneficial
effect of a dielectric material on freeze drying with microwave
heating.Sintered SiC was used as the dielectric material.
Mannitol,a typical pharmaceutical excipient,was
selected as the solute in aqueous solution.The experimental
results show that the use of the dielectric material in microwave
freeze drying can effectively enhance the freeze drying
rate.More than 20% of drying time was saved compared
with conventional freeze drying under the operating conditions
tested.A porous media mathematical model of freeze
drying with hygroscopic effect was derived and solved
numerically using the finite difference method with a moving
boundary.The hygroscopic effect was quantified based on a
modified adsorption–desorption relationship.For mannitol,
the ratio of vapor pressures between the adsorption–desorption
equilibrium and the thermodynamic equilibrium follows
the square root of the moisture saturation.Comparisons of
drying curves between experimental data and theoretical predictions
displayed good agreements.Simulation results also
show that when the solid content of the solution to be freeze
dried is very low or the solid product has a very small loss
factor,microwave heating is less effective unless dielectric
materials are employed.Drying rate controlling factor was
analyzed to be mass transfer in the primary drying stage and
heat transfer in the secondary drying stage.
翻译上面一段
用金山翻译
结论A
实验室规模微波冷冻干燥用具被发展了瞄准了实验性核实电介质材料的有利作用在冷冻干燥与 微波加热.被焊接的SiC使用了作为电介质 材料.甘露醇,一种典型的配药赋形剂,在水溶液被选择了作为溶质.实验性结果表示,对电介质材料的用途 微波冷冻干燥可能有效地提高冷冻干燥率.超过20%干燥时间被保存了和常规冷冻干燥相比在经营之下 情况测试了.冷冻干燥一个多孔媒介数学模型以吸湿作用数字上获得了并且解决了运用有限差分法与a 移动的界限.吸湿作用被定量了根据 一个修改过的吸附解吸附作用关系.为 甘露醇,汽压比率在吸附解吸附作用平衡和热力学平衡之间跟随湿气饱和的方根.比较 干燥曲线在实验性数据之间和理论 预言显示了利益协定.模仿结果也显示那,当解答的固体含量是 干的结冰是非常低的或坚实产品有一非常小 损失因素,微波加热是较不有效的,除非 电介质材料被使用.干燥速率控制因素 分析是质量传递进入主要干燥阶段 并且热传递进入次要干燥阶段.
结论A
实验室规模微波冷冻干燥用具被发展了瞄准了实验性核实电介质材料的有利作用在冷冻干燥与 微波加热.被焊接的SiC使用了作为电介质 材料.甘露醇,一种典型的配药赋形剂,在水溶液被选择了作为溶质.实验性结果表示,对电介质材料的用途 微波冷冻干燥可能有效地提高冷冻干燥率.超过20%干燥时间被保存了和常规冷冻干燥相比在经营之下 情况测试了.冷冻干燥一个多孔媒介数学模型以吸湿作用数字上获得了并且解决了运用有限差分法与a 移动的界限.吸湿作用被定量了根据 一个修改过的吸附解吸附作用关系.为 甘露醇,汽压比率在吸附解吸附作用平衡和热力学平衡之间跟随湿气饱和的方根.比较 干燥曲线在实验性数据之间和理论 预言显示了利益协定.模仿结果也显示那,当解答的固体含量是 干的结冰是非常低的或坚实产品有一非常小 损失因素,微波加热是较不有效的,除非 电介质材料被使用.干燥速率控制因素 分析是质量传递进入主要干燥阶段 并且热传递进入次要干燥阶段.