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CAREER: Multiscale Simulation of Liquid-Vapor Phase Change Heat Transfer

职业：液-汽相变传热的多尺度模拟

基本信息

批准号：
1652578
负责人：
Alexander Rattner
金额：
$ 50.99万
依托单位：
Pennsylvania State Univ University Park
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2023-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1652578&HistoricalAwards=false
关键词：
CAREER Multiscale Simulation Liquid Vapor

项目摘要

Connecting microscale heat transfer and large-scale flows in boiling and condensation in energy systems40% of US energy consumption is used as heat to boil steam for power production. 72% of this energy invested in steam production is rejected to the environment through gas-to-liquid condensation. Boiling and condensation are therefore critical processes in the energy landscape. Improved understanding of these processes can lead to increased efficiencies in power generation, refrigeration, and freshwater distillation. Boiling and condensation are governed by mechanisms that occur over a wide range of size scales, and the interplay between these scales is not yet well understand. For example, in boiling, vapor bubbles form in minute cavities on heated surfaces, grow and detach into the bulk liquid, and merge to form large gaseous structures. Flow and heat transfer effects at these three scales have been postulated to interact in a complex fashion. In this project, computational methods will be developed to predict interactions between scales in boiling and condensation. Experiments will be performed to assess and refine computational models. Resulting models and gained insights will guide engineering of enhanced energy system equipment to improve heat transfer performance and overall efficiency. In a complementary outreach effort, a new teaching module will be developed and implemented in diverse regional secondary schools, introducing energy issues and computer modeling skills. As part of this project, students will collect measurements of residential appliance energy consumption to be incorporated into a web-tool that provides guidance on appliance efficiency and environmental impacts for the public. Research on transport in energy systems will complement development and implementation of a teaching module and classroom-based research project for secondary school students in diverse regional communities introducing energy issues and computer modeling skills. Secondary school student measurements of residential appliance energy consumption will be incorporated into a public web-tool that provides estimates of efficiency and environmental impacts, and guidance on appliance age and cost tradeoffs. At the university teaching level, a new project-driven Energy Systems course will be developed in which students will develop public tutorial videos on key energy technologies.This project seeks to characterize the coupling between micro-scale heat transfer and large-scale fluid dynamics in flow boiling and dropwise condensation through an experimentally validated multiscale simulation framework. By modeling small, dispersed features in an averaged sense, directly tracking trajectories of intermediate vapor and liquid features, and resolving large structures, this approach will capture interactions between scales, which have been understood independently. For flow boiling, this will be applied to study interactions between large vapor bubble wakes and bubble nucleation and the development of two-phase flow structures. For dropwise condensation, this approach will quantify the effects of transport properties on transient condensation and hydrodynamic contributions to heat transfer. The approach will be validated and complemented with experimental high-speed photography and thermal imaging studies. Simulation software will be released open-source to support research for applications in power generation, absorption cooling, water distillation, and electronics cooling.

连接能源系统中沸腾和冷凝的微尺度传热和大尺度流动美国40%的能源消耗都是用来加热蒸汽以生产电力。在蒸汽生产中投入的能量中，有72%通过气液冷凝被排放到环境中。因此，沸腾和冷凝是能源领域的关键过程。更好地了解这些过程可以提高发电、制冷和淡水蒸馏的效率。沸腾和冷凝是由发生在大范围尺度上的机制控制的，这些尺度之间的相互作用还没有很好地理解。例如，在沸腾过程中，蒸汽泡在加热表面上的微小空腔中形成，生长并分离到大量液体中，并合并形成大的气体结构。在这三个尺度上的流动和传热效应已经被假设为以复杂的方式相互作用。在该项目中，将开发计算方法来预测沸腾和冷凝中尺度之间的相互作用。将进行实验，以评估和完善计算模型。由此产生的模型和获得的见解将指导增强能源系统设备的工程设计，以提高传热性能和整体效率。作为一项补充外联工作，将在各区域中学开发和实施一个新的教学单元，介绍能源问题和计算机建模技能。作为该项目的一部分，学生将收集住宅电器能源消耗的测量结果，并将其纳入一个网络工具，为公众提供电器效率和环境影响的指导。关于能源系统中的运输的研究将补充为不同区域社区的中学生制定和实施一个教学单元和课堂研究项目，介绍能源问题和计算机建模技能。中学生对住宅电器能源消耗的测量将被纳入一个公共网络工具，该工具提供效率和环境影响的估计，以及电器年龄和成本权衡的指导。在大学教学层面，将开发一个新的项目驱动的能源系统课程，学生将在其中开发关键能源技术的公共教程视频。该项目旨在通过实验验证的多尺度模拟框架来表征流动沸腾和滴状冷凝中微尺度传热与大尺度流体动力学之间的耦合。通过在平均意义上对小的分散特征进行建模，直接跟踪中间蒸汽和液体特征的轨迹，并解析大的结构，这种方法将捕获尺度之间的相互作用，这些相互作用已经被独立地理解。对于流动沸腾，这将被应用于研究大蒸汽气泡尾迹和气泡成核之间的相互作用和两相流结构的发展。对于滴状冷凝，这种方法将量化的瞬态冷凝和流体动力学的传热贡献的传输性能的影响。该方法将通过实验性高速摄影和热成像研究进行验证和补充。仿真软件将开源发布，以支持发电，吸收式冷却，水蒸馏和电子冷却应用的研究。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Experimental study of interactions between wakes and nucleate boiling in intermittent flow patterns

间歇流型中尾流与核沸腾相互作用的实验研究

DOI：
10.1615/tfec2022.mpp.040970
发表时间：
2022
期刊：
7th Thermal and Fluids Engineering Conference
影响因子：
0
作者：
Zhang, X;Rattner, Alexander S.
通讯作者：
Rattner, Alexander S.

Rational design process for gas turbine exhaust to supercritical CO2 waste heat recovery heat exchanger using topology optimization

采用拓扑优化的燃气轮机排气至超临界CO2余热回收换热器的合理设计过程

DOI：
10.1016/j.applthermaleng.2023.121670
发表时间：
2024
期刊：
Applied Thermal Engineering
影响因子：
6.4
作者：
Adil, Nosherwan;Dryepondt, Sebastian N.;Kulkarni, Anand;Geoghegan, Patrick J.;Zhang, Xiang;Alkandari, Abdulaziz;Rattner, Alexander S.
通讯作者：
Rattner, Alexander S.

Heat transfer during condensing droplet coalescence