Modeling and analysis of heat and mass transfers of supercritical hydrocarbon fuel with pyrolysis in mini-channel
Modeling and analysis of heat and mass transfers of supercritical hydrocarbon fuel with pyrolysis in mini-channel
复制标题
超临界碳氢燃料微通道热解传热传质建模与分析
DOI：
10.1016/j.ijheatmasstransfer.2015.07.095
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发表时间：
2015-12-01
影响因子：
5.2
通讯作者：
Huang, Hongyan
中科院分区：
文献类型：
--
作者：
Feng, Yu;Qin, Jiang;Huang, Hongyan
采用带预处理的时间推进算法，建立了二维非结构网格数值模型，研究了超临界碳氢燃料在微通道内热解的传热传质过程。RK-PR EoS是SRK和PR EoS的统一形式，用于描述裂解燃料混合物的热物理性质。数值试验表明，本文所建立的数值模型能够有效地预测小速度下超临界反应流场的变化。利用该数值模型研究了化学反应流场中流动、传热和热解的耦合关系和相互作用机理，发现化学反应流场中除了速度和温度边界层外，还存在化学反应边界层。在热解的影响下，流动方向上的速度梯度和温度梯度分别增大和减小。化学热沉在通道横截面上表现出不均匀性。但由于径向传热传质的影响，化学热沉的不均匀性降低。(C)2015爱思唯尔有限公司版权所有。
A 2D numerical model was established with unstructured mesh using Time-marching algorithms with preconditioning to investigate the heat and mass transfer of supercritical hydrocarbon fuel with pyrolysis in mini-channel. The three-parameter RK-PR EoS, which is the unified form of SRK and PR EoS, was used to describe the thermophysical properties of cracked fuel mixture including small and large hydrocarbon molecules. Then, Numerical tests indicated that the present numerical model was able to predict the variation of the supercritical reaction flow field with small velocity effectively. Then, the numerical model was employed to study the coupling relationships and interaction mechanisms of flow, heat transfer and pyrolysis in the chemical reaction flow field, and it was found that there was a chemical reaction boundary in addition to velocity and temperature boundary layers in the chemical reaction flow field. And the gradients of velocity and temperature in the flow direction increased and decreased respectively under the influence of pyrolysis. The chemical heat sink exhibited non-uniformity in the cross-section of channel. But, the non-uniformity of chemical heat sink decreased due to heat and mass transfers in the radial. (C) 2015 Elsevier Ltd. All rights reserved.