Nomenclature

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dp - particle diameter, m df - effective liquid film thickness, m D1 - molecular diffusivity in mobile phase, m^2/s Dm - diffusion coefficient in the mobile phase Dп - molecular diffusivity in immobile phase, m^2/s E - power of heat generation f(k) - function of retention factor F - flow rate F1 - fractional volume of mobile phase, m^3/m^3 Fп - fractional volume of immobile phase, m^3/m^3 Fopt - optimum flow h - reduced plate height Hp - peak height H - plate height (HETP) k or k' - retention factor K - distibution factor N - plate count ΔP - pressure dop (bar) ΔPopt - pressure drop at optimum linear velocity (bar) q - heat flux r - column radius rc - column to detector connecting tubing internal radius Rc - column radius Rs - resolution ΔT - radient temperature gradient u or uo - linear velocity Vcell - flow cell volume Vinj - injection volume
 * Nomenclature**

Greek letters γ - labyrinth (obstruction) factor λ - factor in eddy diffusion (packing constant) λ (in eq. 7.) - the radial heat conductivity of the column packing ф - flow resistance η - viscosity of the mobile phase (cP) φ - column resistance νopt - optimum linear velocity α - selectivity ω (w) - peak width τ - response rate τ² - time-related extra-column contribution to band spreading σc² - length variance of the peak in the column σ²total - total band spreading from column and extra-column contributions σν² - volumetric extra-column contribution to band spreading εt - total porosity