Flexible heat pipes in thermal management applications – A comprehensive review

Flexible heat pipes represent an innovative heat transfer technology that offers significant advantages over conventional heat pipes for thermal management. Their ability to easily adapt to complex shapes and geometries enhances their potential in renewable energy applications. This review begins with the fundamental principles and explores the diverse applications of flexible heat pipes, highlighting their unique benefits in each field. Key design considerations, such as container material, wicking structure, and working fluid are discussed in detail to provide a comprehensive understanding of their fabrication methods. Additionally, the review offers insights into experimental studies related to flexible heat pipes, recent advancements, parameters for enhancing thermal performance, and optimization methods. Addressing current challenges requires the use of advanced materials, cutting-edge manufacturing techniques, and custom-designed heat pipes for specific applications. This paper aims to develop a thorough understanding of flexible heat pipes, thereby paving the way for their implementation as a sustainable thermal management solution. • A thorough review of flexible heat pipes has been conducted, focusing on their applications. • Key design factors including flexiblility, container , working fluid, and wick have been examined. • Benefits of integration and limitations of existing technologies have been addressed. • Flexible heat pipes improve energy efficiency and can be considered as sustainable thermal management solutions. • Key challenges and recommendations for future research directions have been identified and proposed.