Effect of Column diameter

Effect of Column Diameter on Flow 

ID can vary from 0.245 to 0.255 for a typical 0.25 mm ID column. When the inlet pressure and length are held constant, the flow rate can change by 16%.

Column Efficiency is dependent on:

  • Flow rate / linear velocity
  • Column diameter
  • Column length
  • Carrier gas molecular weight

Efficiency and Column Diameter

  • The smaller the diameter, the greater the efficiency

Decreasing column diameter results in:

  • Faster run times for a given resolution
  • Increased efficiency
  • Decreased capacity