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芒果滲透脫水-凍結的質(zhì)量與熱量傳遞模擬
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中國農(nóng)業(yè)科學院創(chuàng)新工程資助項目


Modeling of Heat and Mass Transfer during Osmo-dehydrofreezing of Mangoes
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    摘要:

    以細胞作為傳輸過程的基本單元,,建立了一維質(zhì)量傳遞和熱量傳遞數(shù)學模型。滲透脫水質(zhì)量傳遞模型考慮了不同組分在細胞內(nèi),、外,,通過細胞膜與胞間連絲的質(zhì)量擴散,以及在細胞外空間的集流傳輸,。凍結過程的數(shù)學模型建立基于熱平衡方程,,且考慮了相變問題。通過Matlab軟件有限差分方法求解方程,,得到的實驗結果(芒果滲透脫水過程的失水率和增固率,,以及凍結過程的凍結曲線)與模擬結果十分接近,相對偏差控制在15%之內(nèi),,從而驗證了模型的有效性。結果表明:所建立的數(shù)學模型可詳細描述芒果滲透脫水過程中細胞內(nèi),、外水和蔗糖的質(zhì)量濃度分布,,以及凍結過程中的溫度變化。

    Abstract:

    The one-dimensional mass transfer and heat transfer mathematical models were developed by taking mango cells as a basic unit for the effective prediction and process control of osmo-dehydrofreezing. The mass balance equations for the diffusion of different species were established separately for the intracellular and extracellular volumes taking into account the transfer through the cellular membrane and the plasmodesma. Moreover, the model also considered bulk flow of different species in the extracellular volumes. The thermal balance equations for modeling the subsequent freezing step were developed, which included the phase change phenomena. The numerical solutions were solved by a finite difference method with Matlab programs. A good agreement was obtained between the simulated and experimental results including water loss and solid gain during osmotic dehydration and temperature profile during freezing, and the relative error was controlled in 15%, which proved that this model was practical. Numerical results could describe the distribution of water and sucrose in the intracellular and extracellular volumes of mangoes during osmotic dehydration and show the change of temperature at different time during freezing.

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趙金紅,袁越錦,李淑英,丁洋,聶瑩,唐選明.芒果滲透脫水-凍結的質(zhì)量與熱量傳遞模擬[J].農(nóng)業(yè)機械學報,2014,45(12):262-270. Zhao Jinhong, Yuan Yuejin, Li Shuying, Ding Yang, Nie Ying, Tang Xuanming. Modeling of Heat and Mass Transfer during Osmo-dehydrofreezing of Mangoes[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(12):262-270.

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  • 收稿日期:2014-08-17
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  • 在線發(fā)布日期: 2014-12-10
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