In a fluidized bed experiment conducted at room temperature, it cannot be assumed that the particles in the column will be at a specific temperature, such as 20 or 30 degrees Celsius, without further information or control measures.
In a fluidized bed, solid particles are suspended and mixed with a gas or liquid, creating a fluid-like behavior. The temperature of the particles in the bed will depend on various factors, including the initial temperature of the particles, the temperature and composition of the fluidizing medium (gas or liquid), and the heat transfer mechanisms occurring within the system.
If the particles and the fluidizing medium are initially at room temperature, there might be some equilibration and heat transfer between them. However, without additional information or control over the experimental conditions, it is difficult to accurately determine or assume a specific temperature for the particles within the fluidized bed.
Factors such as the size and composition of the particles, the flow rate and composition of the fluidizing medium, and the heat transfer characteristics of the system will influence the temperature distribution within the fluidized bed. To determine the temperature of the particles in the bed, detailed measurements, modeling, or control strategies would be required.