02354nas a2200217   4500008004100000022001400041245009400055210006900149260007200218300001200290490000600302520152700308653000901835653001701844653003001861653003001891653004101921100002901962700002101991856012402012       2011                        eng d  a2005-862400aHeat and mass transfer analysis in air gap membrane distillation process for desalination0 aHeat and mass transfer analysis in air gap membrane distillation  aPO BOX 33, YUSEONG, DAEJEON 305-600, SOUTH KOREAbTECHNO-PRESScJUL  a159-1730 v23 a<p>The air gap membrane distillation (AGMD) process was applied for water desalination. The main objective of the present work was to study the heat and mass transfer mechanism of the process. The experiments were performed on a flat sheet module using aqueous NaCl solutions as a feed. The membrane employed was hydrophobic PTFE of pore size 0.22 mu m. A mathematical model is proposed to evaluate the membrane mass transfer coefficient, thermal boundary layers' heat transfer coefficients, membrane/liquid interface temperatures and the temperature polarization coefficients. The mass transfer model was validated by the experimentally and fitted well with the combined Knudsen and molecular diffusion mechanism. The mass transfer coefficient increased with an increase in feed bulk temperature. The experimental parameters such as, feed temperature, 313 to 333 K, feed velocity, 0.8 to 1.8 m/s (turbulent flow region) were analyzed. The permeation fluxes increased with feed temperature and velocity. The effect of feed bulk temperature on the boundary layers' heat transfer coefficients was shown and fairly discussed. The temperature polarization coefficient increased with feed velocity and decreased with temperature. The values obtained were 0.56 to 0.82, indicating the effective heat transfer of the system. The fouling was observed during the 90 h experimental run in the application of natural ground water and seawater. The time dependent fouling resistance can be added in the total transport resistance.</p>10aAGMD10aDesalination10aheat transfer coefficient10amass transfer coefficient10atemperature polarization coefficient1 aPangarkar, Bhausaheb, L.1 aSane, Mukund, G.  uhttps://library.ncl.res.in/content/heat-and-mass-transfer-analysis-air-gap-membrane-distillation-process-desalination-0