相关实验视频
Updated: Feb 13, 2026

13:19
Deep Neural Networks for Image-Based Dietary Assessment
Published on: March 13, 2021
10.0K
一个深度神经网络模型用于达西-福克海默混合纳米流体流中的热传输,具有激活能量
Mohammad Ayman-Mursaleen1, Syed Tauseef Saeed2, Saja Mohammad Almohammadi3
1Department of Mathematics, Faculty of Science, University of Ostrava, Mlýnská 702/5, 702 00, Ostrava, Czechia. ayman.mursaleen@osu.cz.
Scientific reports
|February 11, 2026
概括
本研究介绍了一种基于发动机油的混合纳米流体,用于工业应用中的增强热管理. 一个新的神经网络模型准确地预测了热量和质量转移,将计算时间减少了45%.
科学领域:
- 磁性水电动力学 (MHD) 是一个学科.
- 纳米流体的热传递
- 非牛顿流体动力学的流体动力学.
背景情况:
- 工业换热器需要高效的热管理,使用稳定的流体,如发动机油.
- 非牛顿流体,如卡森型流体,在工业应用中很常见.
- 混合纳米流体与基础流体相比,提供了增强的热性能.
研究的目的:
- 为了研究卡森型混合纳米流体 (含有Al2O3-TiO2纳米粒子的发动机油) 的MHD流量和热/质量转移.
- 为了结合热辐射的影响,达西-福克海默多孔介质,磁场和激活能量.
- 开发和验证一个优化的Morlet波形神经网络与粒子群优化和神经网络算法 (MWNN-PSO-NNA) 预测流体行为.
主要方法:
- 使用相似性转换,管理方程被转换为ODE.
- 使用Bvp4c解决器获得了数值解决方案.
- 使用Bvp4c解决方案来训练MWNN-PSO-NNA模型进行预测.
主要成果:
- 增加的磁场降低了速度;热辐射提高了温度 (15-25%).
- 更高的激活能量提高了物种度和热反应 (~30%).
- 混合纳米流体显示出优越的热性能;MWNN-PSO-NNA实现了>99%的精度,计算时间减少了45%.
结论:
- 该MWNN-PSO-NNA框架准确地预测了复杂的非牛顿混合纳米流体行为.
- 混合纳米流体配方对工业滑,热控制和冷却系统具有前景.
- 这项研究开创了基于发动机油的卡森混合纳米流体与达西-福克海默效应以及优化的MWNN-PSO-NNA框架的整合.
相关概念视频
Activation Energy
87.1K
Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
87.1K
Mechanism of heat transfer
2.0K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
2.0K
Mechanisms of Heat Transfer I
6.3K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
6.3K
Mechanisms of Heat Transfer II
4.6K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.6K
Mechanisms of Heat Transfer
1.8K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
1.8K
Heat Flow and Specific Heat
6.8K
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
6.8K

