Money versus time: evaluation of flow control in terms of energy consumption and convenience
Money versus time: evaluation of flow control in terms of energy consumption and convenience
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金钱与时间：从能耗和便利性角度评估流量控制
DOI：
10.1017/jfm.2012.139
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发表时间：
2012
影响因子：
3.7
通讯作者：
Quadrio
中科院分区：
文献类型：
--
作者：
Frohnapfel;Hasegawa;Quadrio
以减少流体-固体界面上的表面摩擦阻力为目标的流动控制是一个活跃的基础研究领域，其动机是其在运输领域显着节能和减少排放的潜力。通常，内部流动减阻技术的性能是在两种替代流动条件下评估的，即恒定质量流量或恒定压力梯度。成功的控制导致前一种方法中阻力和泵送功率的减少，而后者导致质量流量和泵送功率的增加。然而，在实际应用中，金钱和时间决定了流量控制的挑战：必须在能量消耗（金钱）和用该能量实现的相应便利性（流量）之间达成折衷，以实现通常取决于具体应用的目标。基于这个想法，我们推导出两个无量纲参数，它们量化了通过给定管道输送给定体积的流体所需的总能量消耗和所需时间（便利性）。在现有框架内重新评估现有减阻策略的性能以及壁面粗糙度的影响；讨论了如何在能耗和便利性之间实现（取决于应用）最佳平衡。研究还表明，这些考虑因素可以扩展到外部流动。
Flow control with the goal of reducing the skin-friction drag on the fluid–solid interface is an active fundamental research area, motivated by its potential for significant energy savings and reduced emissions in the transport sector. Customarily, the performance of drag reduction techniques in internal flows is evaluated under two alternative flow conditions, i.e. at constant mass flow rate or constant pressure gradient. Successful control leads to reduction of drag and pumping power within the former approach, whereas the latter leads to an increase of the mass flow rate and pumping power. In practical applications, however, money and time define the flow control challenge: a compromise between the energy expenditure (money) and the corresponding convenience (flow rate) achieved with that amount of energy has to be reached so as to accomplish a goal which in general depends on the specific application. Based on this idea, we derive two dimensionless parameters which quantify the total energy consumption and the required time (convenience) for transporting a given volume of fluid through a given duct. Performances of existing drag-reduction strategies as well as the influence of wall roughness are re-evaluated within the present framework; how to achieve the (application-dependent) optimum balance between energy consumption and convenience is addressed. It is also shown that these considerations can be extended to external flows.
泵送还是减阻？
DOI：
--
发表时间：
2009
期刊：
Journal of Fluid Mechanics 635
影响因子：
--
作者：
Hoepffner J.;Fukagata K.
通讯作者：
Fukagata K.
DOI：
10.1007/978-3-642-03085-7_48
发表时间：
2009-12
期刊：
--
影响因子：
--
作者：
N. Kasagi;Y. Hasegawa;K. Fukagata
通讯作者：
N. Kasagi;Y. Hasegawa;K. Fukagata