Innovative experimental teaching design and practice of thermal conductivity in heat transfer
[Objective]The cultivation of college students'innovation ability determines the level of national higher education and the level of national core competitiveness.Traditional experiment teaching mainly focuses on demonstration or verification experiments,which makes it difficult to cultivate students'innovative and comprehensive practical abilities.Giving full play to the power of scientific research projects in teaching allows for designing comprehensive experiments with zero investment in experimental equipment and achieving the goal of cultivating students'innovative abilities.To improve the teaching effect of heat transfer experiments,based on the idea of combining teaching and research and the research results of hydrate thermophysical properties,an innovative,comprehensive experiment scheme and teaching effect evaluation index are proposed herein.[Methods]This course uses existing scientific research equipment to design and develop a comprehensive test system for hydrate thermophysical properties to realize the preparation and thermophysical properties testing of hydrate samples in different systems.The teaching experiment program includes measurement principles,preparation of hydrate samples,tester parameter setting,and data screening.Experimental data analysis is integrated into the experimental test process;that is,students must observe the drift,transient,calculated,and residual diagrams of temperature to adjust the test time and heating power and complete the experimental test,data analysis,and group discussion in class.This effectively develops students'ability to think for themselves,communicate and collaborate,and analyze and solve problems.To arouse the enthusiasm of students in the experiment and ensure the quality of the experimental teaching,students can perform different experimental schemes in groups,namely the ice powder group,ice powder-natural sea sand group,and water-natural sea sand group,where carbon dioxide or methane can be chosen as the reaction gas.[Results]The thermal conductivity of hydrate samples is affected by many factors,such as substance composition,temperature,pressure,and the parameter setting of the thermal property tester.In the same experimental group,the thermal conductivity of the CO2 hydrate sample was lower than that of the CH4 hydrate sample.In different experimental groups,the thermal conductivity of the samples in the ice powder(water)-natural sea sand group was higher than that in the ice powder group because of the different substance composition.The thermal conductivity of natural sea sand-ice-hydrate samples was higher than that of natural sea sand-water-hydrate samples because of the difference in sample preparation methods.The course design of different experimental schemes ensured cooperative discussion within the groups and the parameter comparison between the groups,improved the students'innovative,practical ability and logical thinking,and enhanced the experimental teaching effect.In class,students can understand the variables of each experimental group by combining sample materials,preparation methods,and testing processes and deepen their understanding of the basic concepts and testing principles of thermal conductivity.The results of the teaching effect evaluation index show that the student's participation in the experiment is obviously improved.The experimental program after teaching reform is conducive to speeding up students'understanding and mastery of the theoretical knowledge of heat transfer.[Conclusions]The innovative,comprehensive experiment of hydrate thermal conductivity enables students to experience the whole process of theoretical learning-sample preparation-sample testing-data analysis,master correct,rigorous,and scientific thermal conductivity measurement methods,and realize the triple teaching objectives of consolidating theoretical foundation,cultivating innovative thinking,and improving comprehensive practical ability.
science and education integrationexperimental teachinginnovationhydratethermal conductivity
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NSTL
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