Schmidt number data pertaining to autothermal methanol steam reforming reactors at different reaction temperatures
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To obtain the solution of the Schmidt number problem, numerical simulations are performed using fluid mechanics. Schmidt number is a dimensionless number defined as the ratio of momentum diffusivity and mass diffusivity, and it is used to characterize fluid flows in which there are simultaneous momentum and mass diffusion convection processes. The Schmidt number is the ratio of the shear component for diffusivity to the diffusivity for mass transfer. The Schmidt number physically relates the relative thickness of the hydrodynamic layer and mass-transfer boundary layer. The heat transfer analog of the Schmidt number is the Prandtl number. The ratio of thermal diffusivity to mass diffusivity is the Lewis number. The reactor system comprises two separate sets of flow channels, which are located between spaced, highly heat-conductive metal or ceramic separating walls. The medially located separating walls have different catalysts on opposed surfaces. These catalysts are selected for the particular reaction taking place in the adjacent reaction zone. The reactor provides for continuous and simultaneous reaction of two different process reaction streams in the channels defined between the walls, wherein a first process reaction stream undergoes a high temperature exothermic reaction in the first set of flow channels and a second process reaction stream undergoes an endothermic heat-consuming reaction in the second set of flow channels separated from the first set of flow channels by the heat transfer separating walls. More specifically, the reactor system includes a set of reforming channels for steam reformation of methanol and a set of oxidation channels for heating the reactor system to operating temperature. A separating wall therefore separates two adjacent reaction zones and also functions to transfer heat from the oxidation occurring at the catalyst surface in the oxidation zone directly to the reforming catalyst coated on the opposed surface. The reactor system is operated using excess air and water steam. Methanol and air are mixed homogeneously and the mixture is fed directly into the oxidation channels in a specific ratio. Contributor: Junjie Chen, E-mail address: koncjj@gmail.com, ORCID: 0000-0002-5022-6863, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China
为求解施密特数（Schmidt number）相关问题，本研究采用流体力学方法开展数值模拟。施密特数是一种无量纲数，定义为动量扩散率与质量扩散率的比值，用于表征同时存在动量扩散与质量扩散对流过程的流体流动。施密特数亦可表示为扩散率的剪切分量与传质扩散率的比值，从物理意义上关联了流体动力层与传质边界层的相对厚度。施密特数的传热类比量为普朗特数（Prandtl number），而热扩散率与质量扩散率的比值则为刘易斯数（Lewis number）。该反应器系统包含两组独立的流道，两组流道设置于间隔排布的高导热金属或陶瓷分隔壁之间。居中设置的分隔壁两侧表面负载有不同的催化剂，这些催化剂是针对相邻反应区内发生的特定反应而选配的。该反应器可实现两组流道内两种不同工艺反应物料流的连续同步反应：第一组流道内的第一股工艺反应物料流发生高温放热反应，第二组流道内的第二股工艺反应物料流则发生吸热耗热反应，两组流道通过传热分隔壁相互隔离。更具体而言，该反应器系统包含一组用于甲醇水蒸气重整的重整流道，以及一组用于将反应器加热至工作温度的氧化流道。因此，分隔壁一方面将两个相邻的反应区相互隔离，另一方面则可将氧化区催化剂表面发生的氧化反应所释放的热量，直接传递至另一侧表面负载的重整催化剂。该反应器系统采用过量空气与水蒸气进行运行：甲醇与空气经均匀混合后，按特定比例直接送入氧化流道内。贡献者：陈俊杰，电子邮箱：koncjj@gmail.com，ORCID：0000-0002-5022-6863，河南理工大学机械与动力工程学院能源与动力工程系，中国河南省焦作市世纪大道2000号，邮编454000
