Thermal performance of meso-scale oscillatory baffled reactors
Thermal performance of meso-scale oscillatory baffled reactors
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DOI：
10.1016/j.cep.2018.08.009
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发表时间：
2018-10-01
影响因子：
4.3
通讯作者：
Harvey, Adam P.
中科院分区：
文献类型：
--
作者：
Ahmed, Safaa M. R.;Law, Richard;Harvey, Adam P.
本研究报告了在净流量范围 Re-n = 60-2500 和振荡流量范围 Re-o = 01600 上对三种中尺度振荡折流板反应器设计的传热特性和压降的评估。这三种设计是振荡中央折流板反应器 (OCBR)、振荡螺旋折流板反应器 (OHBR) 和振荡孔板折流板反应器 （奥伯）。这些设计根据“热性能”进行评估，将传热和压降考虑在内。有趣的是，在所有设计中，由于某种程度的能量回收，压降都观察到随着振荡的增加而降低。在所有情况下，振荡流量都显着提高了努塞尔数，最高可达约 10 倍。在所有情况下，细观 OBR 都比光滑管中的稳定流动具有更高的热性能。 OHBR、OCBR 和 OOBR 的热性能分别提高了 480%、460% 和 300%。 OHBR 表现出最低的压降，从而使此处研究的设计具有最高的热性能。因此，在本研究的基础上，推荐采用OHBR设计。为每个设计建立了用于预测压降和努塞尔数的新经验相关性，数据大多位于相关性的 +/- 30% 范围内。
This study reports the evaluation of heat transfer characteristics and pressure drops in three designs of meso-scale oscillatory baffled reactors over the net flow range Re-n = 60-2500 and the oscillatory flow range Re-o = 01600. The three designs were the oscillatory central baffled reactor (OCBR), the oscillatory helical baffled reactor (OHBR), and the oscillatory orifice baffled reactor (OOBR). The designs were evaluated in terms of "thermal performance" to take the heat transfer and pressure drop into account.Interestingly, in all designs the pressure drop was observed to decrease with increasing oscillation, due to some degree of energy recovery. In all cases, oscillating the flow significantly enhanced the Nusselt number by upto a maximum of around 10-fold. The meso-OBRs were shown to achieve higher thermal performances than steady flows in smooth tubes in all cases. Up to 480%, 460%, and 300% improvements in thermal performance was achieved for the OHBR, OCBR, and OOBR, respectively. The OHBR exhibited the lowest pressure drop, resulting in the highest thermal performance of the designs investigated here. Hence, on the basis of this study, the OHBR design is recommended. New empirical correlations for predicting pressure drop and Nusselt number were established for each design, with data mostly lying in the range +/- 30% of the correlations.