The physical process of heat transfer including conduction, convection and radiation when the thin metal rod is exposed to the natural environment. After the metal rod is continuously heated and then stopped heating, the temperature of the three processes of temperature rise, steady state and cooling are monitored in real time. By analyzing the proportion of conduction, convection and radiation in heat transfer at different temperature stages, the thermal conductivity, specific heat capacity, convective heat transfer coefficient and emissivity are measured. Compared with the traditional experimental setups, the device has a simple structure, and the heat transfer model extends from one-dimension to three-dimensions, based on the natural cooling of the metal under natural environmental conditions, which helps students better understand the physical processes of heat transfer. The experimental principle also helps students to understand the mathematical methods in physics. This study enriches the teaching content and experimental method of thermal physical property parameter measurement, which is suitable for laboratories to carry out teaching experiments.

A method for measuring the viscosity coefficient of liquids based on the vibration of a tuning fork is proposed. A vibrating plate is fixed at the bottom of the tuning fork arm, and the plate is immersed in the liquid to be measured. By using electromagnetic driving, the tuning fork drives the vibrating plate to make one-dimensional reciprocating motion in the liquid. The measurement of liquid viscosity coefficient is realized by measuring the influence of liquid viscous shear force on vibration characteristics. The correctness of the method is verified by experimental data, and the main sources of measurement errors including density measurement and resonance frequency drift are analyzed. By adding a temperature control device, the measurement of liquid viscosity coefficient at different temperatures can be realized. The device can not only deepen students’ understanding of fluid viscosity and vibration principles, but also provide a new solution for measuring liquid viscosity coefficient in laboratory.

An experimental device for measuring liquid viscosity coefficient was designed and built by using falling film flow. The model was modeled according to the N-S equation of incompressible liquid and combined with boundary conditions. The thickness of liquid film is calculated by measuring the surface velocity of liquid film. The viscosity coefficient of castor oil was measured at different flow rates. The relative accuracy of viscosity coefficient measured at different dip angles was basically the same, and the relative error was below 8%. The application conditions and error sources of the device are analyzed. The thickness of liquid film was compared and verified by total internal reflection method. This study enriches the teaching content and method of measuring liquid viscosity coefficient, helps students to master relevant knowledge of fluid mechanics and improve comprehensive design ability.

At the teacher meeting of Chinese Undergraduate Physics Experiment Competition (CUPEC) held in January 2020, teachers played in role of students. All the participated teachers finished the task by five main periods, which include doing experiment, answering the competition worksheets, correcting papers, group discussion, summary and report. In this paper, we summarize the role inversion teacher meeting, and discuss the direction of physics experiment teaching reform from the aspects of experiment content setting, improvement of experimental teachers, the cultivation of students and teachers' communication, so as to explore the ways to improve the quality of undergraduate physics experiment.