Diffusion in Liquids and Gases  CRE-3301

The Diffusion in Liquids and Gases Trainer (CRE-3301) is an advanced experimental unit designed for the study of mass transfer and diffusion phenomena in both liquids and gases. This educational system provides a practical understanding of molecular diffusion, concentration gradients, and transport mechanisms that are fundamental in chemical reaction engineering, chemical processing, and industrial applications. The trainer enables students and researchers to investigate diffusion behavior under controlled laboratory conditions while demonstrating the principles of Fick’s Law of Diffusion.

The system is specially developed for engineering laboratories, technical institutes, universities, and research centers to provide hands-on experience with diffusion processes occurring in liquid and gaseous media. It combines two separate experimental arrangements in a single integrated setup, allowing comprehensive analysis of diffusion coefficients and mass transport phenomena.

In the liquid diffusion experiment, a concentrated salt solution is placed inside a specially designed U-shaped diffusion tube equipped with numerous vertical capillaries. The U-tube is immersed in a transparent tank filled with demineralized water. Due to the concentration difference between the salt solution and the surrounding water, salt ions diffuse through the capillaries into the water. The capillary arrangement ensures one-dimensional diffusion, enabling accurate observation and analysis of diffusion behavior. A built-in magnetic stirrer continuously mixes the water in the tank to eliminate local concentration variations and maintain uniform conditions throughout the experiment. The increase in salt concentration within the tank is measured using an integrated conductivity meter, providing accurate and reliable experimental data.

For gaseous diffusion studies, the trainer uses a highly volatile solvent contained within a vertical diffusion tube immersed in a temperature-controlled hot water bath. Thermal energy supplied by the heater causes the solvent to evaporate. At the top of the diffusion tube, a controlled airflow generated by a fan removes the solvent vapor continuously, maintaining a stable concentration gradient between the liquid surface and the flowing air. This setup allows detailed investigation of gaseous mass transport and solvent diffusion. The solvent level reduction over time is measured using a height-adjustable precision microscope with fine scale divisions, enabling accurate determination of diffusion rates and coefficients.

The CRE-3301 trainer offers a complete educational platform for understanding diffusion mechanisms in chemical engineering processes. The transparent construction of the apparatus allows clear observation of experimental phenomena, making the learning experience highly visual and interactive. The separate display and control unit includes temperature control functions and fan operation management, ensuring precise adjustment of experimental parameters.