Heat transfer in fluid and solid media and energy systems

目的：1)封闭和开放空腔和流体层中共轭换热(自然对流和混合对流、传导和辐射)的传热学和流体力学问题的理论和实验研究。特别是有限厚度和有限导热的围护墙上离散热源最佳位置的确定，以及流体层中生物对流和热生物对流的不稳定性。Ii)从热力学角度研究可再生能源和新技术系统及其分析，特别是确定它们的性能和氢气生产中的最佳设计条件。科学方法：i)传热-流体力学：1)我们将使用数值方法(有限差分-控制体积方法)求解守恒方程；2)我们将使用解析和数值方法求解简单情况下的守恒方程；3)我们将使用线性和非线性稳定性分析来确定流动稳定性和分叉顺序；4)为了验证理论结果，我们将使用实验方法研究问题的某些方面。2)热力学研究：1)我们将使用(火用)分析方法来评估它们的性能并确定最佳条件，以使它们的性能最大化，并提供设计工具。新的和预期的意义：i)传热-流体力学：应用于可再生能源技术、电子和能量存储系统以及生物反应堆。在许多应用中，由于最优设计条件、流动稳定性和分叉往往是未知的，设计人员仍然使用经验关系。我们的成果将是解决这些问题的重要贡献。二)热力学研究：可再生能源系统和新能源技术被确定为优先研究领域。通过分析和吸收太阳能制氢方法中的新想法和解决方案，我们将能够为这些系统的改进做出贡献。

Objectives: i) The theoretical and experimental study of heat transfer and fluid mechanics problems involving conjugate heat transfer (natural and mixed convection, conduction and radiation) in closed and open cavities and fluid layers. In particular, determination of the optimum positions of discrete heat sources on enclosure walls with finite thickness and conductance, and instability in bioconvection and thermo-bioconvection in fluid layers. ii) The study of renewable energy and new technology systems and their analysis from the thermodynamics point of view; in particular, determination of their performance and optimum design conditions in hydrogen production.Scientific approach: i) Heat transfer-fluid mechanics: 1) we will solve the conservation equations using numerical methods (the finite difference - control volume methods); 2) we will solve the conservation equations for simple cases using analytical and numerical methods; 3) we will use linear and non-linear stability analyses to determine flow stability and bifurcation sequences; 4) to verify theoretical results, we will study certain aspects of the problems using experimental methods. ii) Thermodynamic studies: 1) we will use the exergy analysis method to evaluate their performance and to determine optimum conditions to maximize their performance and to provide design tools.Novelty and expected significance: i) Heat transfer-fluid mechanics: The applications are in renewable energy technologies, in electronic and energy storage systems, and in bio-reactors. In many applications, designers still use empirical relations since the optimum design conditions, stability of flow and bifurcation often are not known. Our results will be important contributions addressing these issues. ii) Thermodynamic studies: The renewable energy systems and the new energy technologies are identified as priority research areas. By analyzing and incorporating new ideas and solutions in solar - hydrogen production methods, we will be able to contribute towards the improvement of these systems.