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Hijaz, Hiras Ahamed; Zargar, Masoumeh; Shafieian, Abdellah; Razmjou, Amir; Khiadani, Mehdi
Separation and purification technology, 12/2024, Letnik: 350Journal Article
Display omitted •Temperature distribution remains notably unaffected by changes in feed salinity.•Loss of driving force increases with lowering permeate temperature impacting flux.•Asymmetricity in polarisation occurs in counter-current flow due to inlet proximity.•Asymmetricity in polarisation for concurrent flow is not obvious. Conventionally, a single Temperature Polarisation Coefficient (TPC) value is calculated to quantify Temperature Polarisation (TP). In this research, the extent of polarisation is investigated by capturing temperature profiles at specific points along a MD membrane using miniature thermocouples, eliminating the need for TPC calculations. The extent of polarisation at a point is affected by two contributory factors, namely the proximity of flow inlets and the difference in vapour pressure across the membrane at that point. Under this direction, this work examined the influence of permeate temperature, feed salinity, and flow direction on the development of the temperature profiles. Our analysis revealed an elevation in TP on both sides of the membrane when the permeate temperature was increased. In addition, changes in feed salinity had a very minute impact on the development of the temperature profiles. By comparing the cocurrent and counter-current flow, the influence of the two contributory factors was further proved, with counter-current flow working better for long membrane modules. Furthermore, an investigation on the symmetricity of polarisation across the membrane revealed asymmetricity depends on the operating conditions, especially direction of flow. The asymmetricity was infinitesimal at low inlet temperature differences for cocurrent flow.
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