[Zhejiang University] Rotating liquid comprehensive experimental instrument
The Rotating Liquid Comprehensive Experimental Instrument is a versatile device that integrates principles from mechanics, electricity, and optics to conduct various physics experiments. It allows for the measurement of gravitational acceleration, viscosity coefficient, and optical properties of rotating liquids, making it an essential tool in advanced physics education.
This instrument consists of several key components: a rotating mechanism, a speed control module, a digital speed display, a laser system, and various measuring tools. The rotating platform is driven by a motor, and the disc on top can rotate smoothly. A control panel includes switches for direction and speed adjustment, as well as a digital display for real-time monitoring. Two vertical support rods are mounted on the cabinet, allowing users to fix and adjust different experimental components such as a horizontal scale, protractor, vertical screen, and wire-hanging cylinder. A cylindrical container is fixed on the turntable, where liquid is placed for experimentation.
Through precise control of rotation speed, this device enables students to observe and measure the effects of centrifugal force and fluid dynamics. By analyzing the shape of the liquid surface, which forms a paraboloid under rotation, students can calculate gravitational acceleration using two methods: one based on height differences, and another using laser reflection. Additionally, the parabolic surface can act as a concave mirror, enabling optical experiments that explore focal length and rotational speed relationships.
To measure the viscosity of a liquid, a wire-suspended cylinder is placed at the center of the container. As the liquid rotates, the cylinder remains stationary due to the balance between viscous resistance and torsional force. This setup allows for accurate calculation of the liquid’s viscosity coefficient.
The Rotating Liquid Comprehensive Experimental Instrument is not only a powerful teaching tool but also an engaging way to explore complex physical phenomena. It combines multiple disciplines—fluid mechanics, geometric optics, and physical optics—offering students a hands-on experience that enhances both their practical skills and theoretical understanding. This experiment is ideal for university-level physics labs, promoting critical thinking and scientific inquiry.
Title: Rotating Liquid Comprehensive Experiment Instrument
Developer: Zhejiang University Physics Experiment Teaching Center
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