A continuous flow microfluidic calorimeter: 3-D numerical modeling with aqueous reactants.
A continuous flow microfluidic calorimeter: 3-D numerical modeling with aqueous reactants.
复制标题
DOI：
10.1016/j.tca.2014.09.024
复制
发表时间：
2015-03-10
影响因子：
3.5
通讯作者：
Larson, Dale
中科院分区：
文献类型：
--
作者：
Sen, Mehmet A.;Kowalski, Gregory J.;Fiering, Jason;Larson, Dale
关键词：
对具有同向流结构的微通道反应器内的反应流场、组分扩散和传热过程进行了计算分析。两股平行相邻的含水反应物流沿着宽、浅、封闭的通道流动，该通道与固定在温度控制板上的基底接触。Fluent计算流体动力学软件包求解了Navier-Stokes方程、质量输运方程和能量方程。通过计算微通道内几个控制体积的能量平衡，验证了包括反应焓作为非均匀热源的能量模型。分析表明，在垂直于衬底表面的方向上，温度在通道厚度上几乎是均匀的;因此，在表面处或表面附近由传感器进行的测量代表平均温度。此外，用玻璃基板和硅胶盖对通道进行建模表明，热传递主要是由于玻璃基板。最后，使用数值计算结果，我们建议，微量热计可以基于这种配置，和温度传感器，如光学纳米孔阵列传感器可以有足够的空间分辨率，以确定反应焓。
A computational analysis of the reacting flow field, species diffusion and heat transfer processes with thermal boundary layer effects in a microchannel reactor with a coflow configuration was performed. Two parallel adjacent streams of aqueous reactants flow along a wide, shallow, enclosed channel in contact with a substrate, which is affixed to a temperature controlled plate. The Fluent computational fluid dynamics package solved the Navier–Stokes, mass transport and energy equations. The energy model, including the enthalpy of reaction as a nonuniform heat source, was validated by calculating the energy balance at several control volumes in the microchannel. Analysis reveals that the temperature is nearly uniform across the channel thickness, in the direction normal to the substrate surface; hence, measurements made by sensors at or near the surface are representative of the average temperature. Additionally, modeling the channel with a glass substrate and a silicone cover shows that heat transfer is predominantly due to the glass substrate. Finally, using the numerical results, we suggest that a microcalorimeter could be based on this configuration, and that temperature sensors such as optical nanohole array sensors could have sufficient spatial resolution to determine enthalpy of reaction.
登录
查看更多内容
影响因子：
64.8
作者：
Ebbesen, TW;Lezec, HJ;Wolff, PA
通讯作者：
Wolff, PA
影响因子：
120.1
作者：
Ladbury, John E.;Klebe, Gerhard;Freire, Ernesto
通讯作者：
Freire, Ernesto
影响因子：
6.1
作者：
Azzouz, T.;Tauler, R.
通讯作者：
Tauler, R.
影响因子：
7.4
作者：
Navea, S;de Juan, A;Tauler, R
通讯作者：
Tauler, R
DOI：
10.1088/0960-1317/24/3/034006
发表时间：
2014-03
期刊：
Journal of micromechanics and microengineering : structures, devices, and systems
影响因子：
--
作者：
Conway AJ;Saadi WM;Sinatra FL;Kowalski G;Larson D;Fiering J
通讯作者：
Fiering J