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tata118119金虫 (小有名气)
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干燥是高能耗操作，对于传统的干燥方法，干燥速度和能源消耗是成正比。但是，在这项研究中，我们发现对于电流体动力学干燥情况有所不同，这可能是由于其干燥机理造成的。对于电流体动力学干燥，它是通过电极产生电晕风来使豆腐进行干燥地。在相同温度下，两个电极之间电压越高，电晕风强度越大。当相邻的针间距较小时，相邻的两针所产生的离子风在到达到豆腐表面之前有一部分相互碰撞使其一部分能量被抵消，从而当它们达到豆腐表面时，传递给豆腐表面水分子的能量减小，导致干燥速度变慢，而当相邻的针间距较大时（相邻的两针所产生的离子风在到达到豆腐表面时还存在一定距离，在这段距离内的豆腐表面水分子未能得到能量，从而使干燥速度也较慢。当相邻的针间距适中时，相邻的两针所产生的离子风在到达到豆腐表面时刚好相遇，既没有离子风的能量抵消现象，又未出现作用间隙，即豆腐表面都能得到离子风的作用，从而使干燥速度最快。 Drying is the high energy consumption operation, as for the traditional drying process, the relation between the drying rate and the energy consumption is direct proportion. But in this study, we found it is different for the EHD drying, which might be associated with drying mechanisms. For EHD-drying, the electrode produces corona wind，which resembles a round jet, impinges and removes moisture from the surface of tofu. At the same temperature, the higher the voltage between the two electrodes, the bigger is the corona wind intensity. When the gap between the two neighboring needles was less, a part of the corona wind generated by the adjacent needle had an inter-collision before reaching the surface of tofu, as a result, a part of the energy was offset, so the drying rate was lower, when the distance between the adjacent needle was larger , the corona wind generated by the adjacent needle reach the surface of tofu exists a certain distance where the water molecules do not get energy, so that drying rate was slower. When the distance between adjacent needle was moderate, the corona wind generated by the adjacent needle to reach the surface at the tofu just met, neither the phenomenon of the corona wind energy to offset , nor a role of space, that is, entire surface of the tofu can get the corona wind, making the fastest drying rate. [ Last edited by tata118119 on 2009-2-11 at 10:49 ] |
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干燥是高能耗操作，对于传统的干燥方法，干燥速度和能源消耗是成正比。 Drying is a high energy consuming process. Normally, the drying rate is increased with energy consumption. 但是，在这项研究中，我们发现对于电流体动力学干燥情况有所不同，这可能是由于其干燥机理造成的。 However, we found it was different for the EHD drying because of its unique drying mechanism. 对于电流体动力学干燥，它是通过电极产生电晕风来使豆腐进行干燥地。 For EHD-drying, electrodes produce corona wind to dry tofu. 在相同温度下，两个电极之间电压越高，电晕风强度越大。 At the same temperature, the higher the voltage between the two electrodes, the bigger the corona wind intensity. 当相邻的针间距较小时，相邻的两针所产生的离子风在到达到豆腐表面之前有一部分相互碰撞使其一部分能量被抵消，从而当它们达到豆腐表面时，传递给豆腐表面水分子的能量减小，导致干燥速度变慢， If the neighboring needles were too close, some corona wind generated by the adjacent needles would collide before reaching the tofu surface, resulting in losing energy and decreasing drying rate. 而当相邻的针间距较大时（相邻的两针所产生的离子风在到达到豆腐表面时还存在一定距离，在这段距离内的豆腐表面水分子未能得到能量，从而使干燥速度也较慢。 The situation would be the same as the neighboring needles were too far away, which was due to the fact that the corona wind could not reach the surface of tofu. 当相邻的针间距适中时，相邻的两针所产生的离子风在到达到豆腐表面时刚好相遇，既没有离子风的能量抵消现象，又未出现作用间隙，即豆腐表面都能得到离子风的作用，从而使干燥速度最快。 As the distance between adjacent needles was appropriate, the generated corona wind could met each other on the tofu surface without any energy lose. In other words, the tofu surfaces could be completely covered by the corona wind, and exhibited the fastest drying rate. |
2楼2009-02-13 20:41:57
