Mass Flux
Mass Flux - Related Videos
09:05
Measurements of CO2 Fluxes at Non-Ideal Eddy Covariance Sites
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2019
The presented protocol uses the eddy covariance method at non-typical locations, applicable to all types of short-canopy ecosystems with limited area, on a currently reforested windthrow site in Poland. Details of measuring site setup rules, flux calculations and quality control, and final result analysis, are described.
01:15
Electric Flux
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2025
The concept of flux describes how much of something goes through a given area. More formally, it is the dot product of a vector field within an area. For a better understanding, consider an open rectangular surface with a small area that is placed in a uniform electric field. The larger the area, the more field lines go through it and, hence, the greater the flux; similarly, the stronger the electric field (represented by a greater density of lines), the greater the flux. On the other hand, if...
05:47
Oxygen Flux Measurements to Evaluate Mitochondrial Respiration in Living and Permeabilized Cells
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2026
Source: Elettra Leo1, Luiza H.D. Cardoso1, Sabine Schmitt1, Erich Gnaiger11Oroboros InstrumentsThis video explains how oxygen flux is used to assess mitochondrial respiration in living and permeabilized mammalian cells. It demonstrates the sequential use of digitonin, metabolic substrates, ADP, an uncoupler, and an inhibitor to characterize different respiratory states. The resulting oxygen flux profile reveals mitochondrial function and energy-coupling efficiency under defined conditions.
03:54
Monitoring B Cell Activation with Antigenic Liposomes using a Calcium-Flux Assay
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2025
This video showcases the assessment of B cell activation through the utilization of antigenic liposomes. B cells treated with calcium-sensitive Indo-1 dye are distinguished using flow cytometry, and their violet-to-blue fluorescence ratio is analyzed. As the cells encounter antigenic liposomes, it triggers B cell activation through calcium influx, progressively enhancing the violet-to-blue fluorescence signal ratio over time.
10:49
Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Cited by 18 •
2014
Lake eutrophication is a water quality issue worldwide, making the need to identify and control nutrient sources critical. Laboratory determination of phosphorus release rates from sediment cores is a valuable approach for determining the role of internal phosphorus loading and guiding management decisions.
FAQs
Convective transport links the moving material to fluid density and velocity, whereas diffusive transport responds to concentration gradients. This distinction helps engineers determine whether movement is primarily associated with bulk fluid motion or with differences in concentration across a region. Identifying the dominant contribution supports more appropriate analysis of transport through fluids, interfaces, or porous media.
Fluid density and velocity are the principal quantities associated with the convective contribution. Changes in either variable alter how much material is transported with the moving fluid. Evaluating these quantities allows engineers to compare transport conditions within systems such as pipes or porous media and to assess how operating conditions may influence material movement.
The area provides the basis for normalizing a mass flow rate, so the same total transport can produce different flux values across different cross-sectional areas. This area-based perspective makes results more useful for comparing locations, interfaces, or equipment configurations. It also supports engineering decisions involving system sizing and the efficiency of material transport.
A practical calculation begins by determining the mass flow rate crossing the relevant section and identifying the area through which it passes. Dividing the flow rate by that area produces the area-normalized transport measure. Engineers can then relate the result to density, velocity, or concentration-gradient information to interpret whether convective or diffusive effects are important.
Engineers apply Mass Flux when analyzing how materials move through pipes, porous media, and interfaces. The measure is useful for examining transport behavior rather than only total throughput, allowing comparisons among sections or configurations with different areas. These evaluations can inform equipment sizing, process optimization, and judgments about how effectively a system moves material.
In membrane separation and evaporation, the area-normalized transport measure helps characterize how material crosses or leaves an interface. Engineers can use it to evaluate transport performance and compare process conditions without relying only on total mass flow rate. This information is relevant to assessing separation behavior, evaporation performance, and the design or optimization of related equipment.
Chemical reactor analysis can use Mass Flux to examine how efficiently materials move within or through the reacting system. Relating transport rates to the relevant area provides a basis for evaluating material movement alongside reactor operation. This perspective helps connect transport behavior with process optimization and with judgments about whether equipment supports the intended material-transfer performance.