Heat transfer during dry spinning of fibers

Summary Heat transfer to fibers formed in dry spinning has been subjected to fundamental analysis. Solutions of the equation of energy have been derived and tested with experimental data. Results were deemed satisfactory in view of the accuracy of the experimental data. The present work is believed to yield a good representation of the heat transfer in the dry spinning process.Nomenclature h heat transfer coefficient, cal/cm² °C sec - k thermal conductivity, cal/cm °C sec - r radial distance, cm - t time, sec - Z axial distance, cm - A surface area, cm² - A_n or n-th root of - A₀ energy required for solvent evaporation, cal/sec cm³ - C_p specific heat cal/gm °C - J₀ Bessel function of first kind, order zero - J₁ Bessel function of first kind, order one - J₂ Bessel function of first kind, order two - N k/(R²C_pV) - Q volumetric flow rate cm³/sec - R outside radius, cm - T point temperature, °C - T_S surface temperature °C - T₀ initial fiber temperature °C - T ambient air temperature, °C - average fiber temperature, °C - ₁ average fiber temperature of preceding segment, °C - V average fiber velocity relative to air strean, cm/sec - V_r radial velocity component, cm/sec - V_z axial velocity components, cm/sec - V direction velocity component cm/sec - W weight of solvent evaporated in a given fiber segment, gms - _n a solution of the equation J₀(X)=0 - heat of vaporization of solvent, cal/gm - dimension - r/R - density, gms/cc