EAGER: Fundamentals of soft heat exchangers

EAGER：软热交换器的基础知识

• 批准号: 1724452
• 负责人: Konrad Rykaczewski
• 金额: $ 13.7万
• 依托单位: Arizona State University
• 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: 2017-08-15 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1724452&HistoricalAwards=false
• 关键词: EAGER; Fundamentals; soft; heat; exchangers

Highly stretchable heat exchangers could dramatically improve current thermoregulatory garments used in emergency and medical applications, such as firefighting, hazardous material cleanup, and medically required thermoregulation. These types of heat exchangers also would be the future basis for the thermal management of soft and wearable electronic technologies. In many such applications, active liquid cooling would be needed to dissipate combined heat from the electronics and the user's body. The fabrication of a stretchable, liquid cooled pad that could dissipate thermal loads only recently became possible due to the development of new classes of materials, such as hyperelastic liquid metal and elastomer composites. An added benefit of stretchable heat exchangers is that stretching the material could remove fouling deposits that deteriorate the performance of such devices in many industrial settings, which would provide a cost-effective, environmentally friendly alternative to currently utilized chemical and scrubbing cleaning methods. This research project aims to demonstrate a novel concept of soft heat exchangers that undergo shape change during operation and to develop a theoretical framework for prediction of their thermal performance. As part of this research project, semester-long "soft heat exchanger design challenge" class projects are being developed and assigned, which will increase the number of students involved in this research and accelerate the design and generation of soft, liquid cooled, wearable technologies.Stretching will violate most assumptions used in design of conventional heat exchangers (e.g. constant areas and cross sections, heat transfer coefficients, and flow rates). Consequently, the design of soft heat exchangers requires development of new theoretical approaches for predicting their thermal performance. The primary hypothesis of this proposal is that quasi-static shape model can predict the thermal transport processes occurring within the device if its shape change occurs on a much longer time scale than the slowest heat transfer process (i.e., the device operates in the "gradual shape modulation regime"). Time scaling and the quasi-static shape models for single stream and concentric tube heat exchangers undergoing axial stretching and compression are being developed and tested experimentally. If the hypothesis is validated, then the quasi-static models can be used as a predictive tool to design devices operating in the gradual shape modulation regime. In case where the device operates in the "rapid shape modulation regime," in which time scales for the shape change are shorter or comparable to at least one heat transfer process, transient governing equations with moving boundary conditions are being solved. This research project serves as motivation for the development of theories for devices operating in this regime and provides preliminary experimental data for their validation.

高弹性热交换器可以显着改善目前用于紧急和医疗应用的温度调节服装，例如消防、危险材料清理和医疗所需的温度调节。 这些类型的热交换器也将成为软和可穿戴电子技术热管理的未来基础。 在许多此类应用中，需要主动液体冷却来消散电子设备和用户身体的综合热量。 由于新型材料（例如超弹性液态金属和弹性体复合材料）的开发，直到最近才成为可能制造可消散热负荷的可拉伸液体冷却垫。 可拉伸热交换器的另一个好处是，拉伸材料可以去除污垢沉积物，这些污垢沉积物会在许多工业环境中降低此类设备的性能，这将为目前使用的化学和擦洗清洁方法提供一种经济高效、环保的替代方案。 该研究项目旨在展示一种在运行过程中发生形状变化的软热交换器的新概念，并开发预测其热性能的理论框架。作为该研究项目的一部分，正在开发和分配为期一个学期的“软热交换器设计挑战”课程项目，这将增加参与这项研究的学生数量，并加速软液冷可穿戴技术的设计和生成拉伸将违反传统热交换器设计中使用的大多数假设（例如恒定的面积和横截面、传热系数和流速）。因此，软热交换器的设计需要开发新的理论方法来预测其热性能。该提案的主要假设是，如果设备的形状变化发生的时间范围比最慢的传热过程长得多，则准静态形状模型可以预测设备内发生的热传输过程（即设备以“逐渐”运行）。形状调制机制”）。正在开发和实验测试单流和同心管热交换器经受轴向拉伸和压缩的时间尺度和准静态形状模型。如果假设得到验证，那么准静态模型可以用作预测工具来设计在渐进形状调制状态下运行的设备。如果设备在“快速形状调制状态”下运行，其中形状变化的时间尺度较短或与至少一种传热过程相当，则正在求解具有移动边界条件的瞬态控制方程。该研究项目为在此状态下运行的设备理论的发展提供了动力，并为其验证提供了初步的实验数据。

项目成果

Fundamentals of soft thermofluidic system design

软热流系统设计基础

• DOI: 10.1039/d0sm00504e
• 发表时间: 2020-07
• 期刊: Soft Matter
• 影响因子: 3.4
• 作者: Kotagama, Praveen;Manning, Kenneth C.;Rykaczewski, Konrad
• 通讯作者: Rykaczewski, Konrad

Rational Design of Soft, Thermally Conductive Composite Liquid‐Cooled Tubes for Enhanced Personal, Robotics, and Wearable Electronics Cooling

用于增强个人、机器人和可穿戴电子设备冷却的软导热复合液体冷却管的合理设计

• DOI: 10.1002/admt.201800690
• 发表时间: 2019-02-27
• 期刊: Advanced Materials Technologies
• 影响因子: 6.8
• 作者: Praveen Kotagama;A. Phadnis;K. Manning;K. Rykaczewski
• 通讯作者: K. Rykaczewski

Modeling thermal contact resistance at the finger-object interface

模拟手指-物体界面处的热接触电阻

• DOI: 10.1080/23328940.2018.1551706
• 发表时间: 2018-12-10
• 期刊: Temperature
• 作者: K. Rykaczewski