The role of Joule heating in dispersive mixing effects in electrophoretic cells: Hydrodynamic considerations

Batch electrophoretic cells with Eyring fluids: Analysis of the hydrodynamics

“…The velocity profile computed in this investigation is useful in making comparisons among the carrier fluids with different rheologies [1,2,9,10] value of the Joule heating number is high enough to produce a temperature value at the center of the cell which is higher than the temperature values at the walls. Figure 5 shows the remarkably different behavior that non-Newtonian carrier fluids may demonstrate under the influence of the Joule heating effect, compared to the behavior of Newtonian carriers.…”

“…This research attempts to determine the effect of Joule heating on the velocity profile inside the electrophoretic cell. To this end, a methodology originally proposed by Bosse and Arce [1,2] will be used. Their approach seeks a sequential coupling among the different modes of transport.…”

“…Less known is the use of carrier rheology and related factors to maintain low levels of mixing due to Joule heat generation, and/or to favor enhancement of separation efficiency. Modification of the carrier-fluid rheology to decrease free convection currents has also been suggested [1,9]. More recently, this aspect has been studied systematically by Bosse et al [9,10] for the case of the power-law model.…”

“…The objectives of the present study are (i) to increase knowledge of the behavior of non-Newtonian carrier fluids used to control convective-diffusive problems inside a discontinuous electrophoretic cell; (ii) to improve understanding of the influence of Joule heating on the behavior of the temperature profile inside the electrophoretic cell; (iii) to determine the influence of Joule heating on the hydrodynamic velocity profile inside the electrophoretic cell for the case of Eyring-model non-Newtonian carriers [1]; (iv) to compare the results of the present study with those obtained using other rheologies analyzed in previous studies [1,2,6,9]. According to the above general objectives, the device selected to perform the analysis is shown in Fig.…”

Zone Electrophoresis in an Inner-cooling Wide-bore Electrophoresis System with UV Detection

“…In electrophoresis, the Joule heat generates a radial temperature distribution in the liquid solution and the solid capillary wall, which exhibits a parabolic-like pattern with the centerline having the highest temperature. [15][16][17] This radial temperature distribution becomes more serious as the diameter of the separation tube increases, even under the same physicochemical conditions. 18 This unevenness can complicate the profile of the electrical conductivity, dynamic viscosity and diffusion coefficient across the electrophoresis channel.…”