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Design and characterization of visible-light LED sources for microstructured photoreactors†
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2018-10-09 00:00:00 , DOI: 10.1039/c8re00165k Anca Roibu 1, 2, 3, 4 , Rishi Bharadwaj Morthala 1, 2, 3, 4 , M. Enis Leblebici 1, 2, 3, 4 , Dorota Koziej 5, 6, 7, 8, 9 , Tom Van Gerven 1, 2, 3, 4 , Simon Kuhn 1, 2, 3, 4
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2018-10-09 00:00:00 , DOI: 10.1039/c8re00165k Anca Roibu 1, 2, 3, 4 , Rishi Bharadwaj Morthala 1, 2, 3, 4 , M. Enis Leblebici 1, 2, 3, 4 , Dorota Koziej 5, 6, 7, 8, 9 , Tom Van Gerven 1, 2, 3, 4 , Simon Kuhn 1, 2, 3, 4
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The design of stable, compact, and uniform LED light sources for continuous microstructured photoreactors is reported. The electrical and thermal properties of green LEDs are translated into an efficient control and cooling strategy. To study the irradiance uniformity and efficiency to irradiate the microfluidic channel, narrow viewing angle LEDs were configured in four arrays. The irradiance uniformity experienced by the microchannel is determined with an irradiance model, which is improved by using near-field goniophotometer measurements for small distances between the light source and reactor. Maximum light uniformity is achieved below the LED-reactor distance of 1.5 cm. Exceeding this distance and employing arrays with a larger number of LEDs did not improve the uniformity on the microchannel. Furthermore, the energy efficiency of the photoreactor is quantified by combining near-field goniophotometer measurements, irradiance modeling and actinometry. It was shown that below 2 cm the photon losses were reduced when the LED positions matched the microchannel geometry, however a low utilization of the consumed electrical energy is observed irrespective of the LED array design. The characterization methodology presented in this study enables the identification and quantification of the limiting factors.
中文翻译：
用于微结构光反应器的可见光LED光源的设计和表征†
报道了用于连续微结构光反应器的稳定，紧凑且均匀的LED光源的设计。绿色LED的电和热特性转化为有效的控制和冷却策略。为了研究辐照度的均匀性和辐照微流体通道的效率，在四个阵列中配置了窄视角LED。微通道所经历的辐照度均匀性是通过辐照度模型确定的，对于光源和反应堆之间的小距离，可通过使用近场测角光度计测量来改善这种辐照度模型。在低于1.5 cm的LED反应器距离时，可获得最大的光均匀度。超过此距离并使用具有更多数量的LED的阵列并不能提高微通道的均匀性。此外，光反应器的能量效率是通过结合近场测角光度计测量，辐照度建模和光化法来量化的。结果表明，当LED的位置与微通道的几何形状匹配时，在2 cm以下，光子的损失减少了，但是，无论LED阵列的设计如何，所消耗的电能利用率都很低。在这项研究中介绍的表征方法使识别和量化限制因素成为可能。
更新日期：2018-10-09
中文翻译：
用于微结构光反应器的可见光LED光源的设计和表征†
报道了用于连续微结构光反应器的稳定，紧凑且均匀的LED光源的设计。绿色LED的电和热特性转化为有效的控制和冷却策略。为了研究辐照度的均匀性和辐照微流体通道的效率，在四个阵列中配置了窄视角LED。微通道所经历的辐照度均匀性是通过辐照度模型确定的，对于光源和反应堆之间的小距离，可通过使用近场测角光度计测量来改善这种辐照度模型。在低于1.5 cm的LED反应器距离时，可获得最大的光均匀度。超过此距离并使用具有更多数量的LED的阵列并不能提高微通道的均匀性。此外，光反应器的能量效率是通过结合近场测角光度计测量，辐照度建模和光化法来量化的。结果表明，当LED的位置与微通道的几何形状匹配时，在2 cm以下，光子的损失减少了，但是，无论LED阵列的设计如何，所消耗的电能利用率都很低。在这项研究中介绍的表征方法使识别和量化限制因素成为可能。
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