Master theses / Diploma theses / Student Assistant / Volunteer internship

Nucleate boiling is one of the most efficient heat transfer modes and is widely used in industrial applications, such as nuclear reactor, boiler, electronics cooling system and batteries thermal management. During the boiling process, a large amount of heat is removed from the wall due to the presence of intensive phase change. The heat transfer in the nucleate boiling process is strongly dependent on the bubble dynamics, including bubble generation, growth, departure and detachment. In particular, the evaporation from the microlayer shows great potential to enhance the heat transfer performance. However, the experiment comparable simulation of the microlayer profile and the evaporation performance in the nucleate boiling are still not lacking, which significantly restricts our understanding of the nucleate boiling. Based on our previous results, a large part of the reason is that the surface molecular effects are long-standing ignored. In this project, the dynamics of a single bubble in the nucleate boiling will be investigated by using DNS simulation. The effect of surface structures on the microlayer profile and bubble growth are our focuses.

Tasks:

• Literature review of the microlayer simulation in the nucleate boiling process
• Implementation of our previous contact line model in the DNS simulation
• DNS simulation of nucleate boiling on horizontal surfaces
• DNS simulation of nucleate boiling on structured surfaces
• Analysis of the surface structure effects in terms of heat transfer and bubble dynamics

• Experienced in fluid dynamics simulations, e.g., fluent, CFX
• Academic studies in the field of fluid mechanics, chemical engineering, mechanical engineering or comparable fields of study.
• Knowledge in fluid dynamics, heat and mass transfer phenomena

Bearbeitungszeit: 6 Monate (Beginn ab sofort möglich)