ABSTRACT

Transient heat transfer problems occur when the boundary conditions of a system are changed suddenly. For example, if an abrupt change in temperature or heat flux is applied to a system, the temperature will change until a new steady state condition is achieved. Heat may be lost from the surface in the form of radiation and convection, and internal temperature gradients may develop due to conduction. In special cases, the internal temperature distribution may be neglected, and a much simpler approach called the lumped capacitance method can be used to determine the temperature response of the system. This teaching seminar will present the lumped capacitance method, define the criteria for its validity, and give an example implementation.

BIOGRAPHY

David B. Brown completed his Ph.D. in Mechanical Engineering at the Georgia Institute of Technology in 2019. His research interests are heat transfer, energy systems, and hypersonics. During his Ph.D., he used ultrafast lasers to investigate the thermal transport in two-dimensional materials and thin films for the thermal management of electronic devices and other energy systems. David received multiple fellowships, including the National Science Foundation Graduate Research Fellowship. In 2018, he won an Outstanding Paper Award at the IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems. After graduation, he joined Raytheon Intelligence and Space (formerly Raytheon Space and Airborne Systems) in El Segundo, CA, where he used his heat transfer background to perform thermal analysis of spacecraft hardware. David is currently a Chancellor’s Postdoctoral Fellow in the Mechanical and Aerospace Engineering Department at the University of California, Los Angeles. His current research focuses on high-temperature thermal properties and cooling of hypersonic leading edges.