Convection Roll Analysis
Convection Roll Analysis - Related Videos
11:04
Systematic Analysis of In Vitro Cell Rolling Using a Multi-well Plate Microfluidic System
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Cited by 4 •
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This study used a multi-well plate microfluidic system, significantly increasing throughput of cell rolling studies under physiologically relevant shear flow. Given the importance of cell rolling in the multi-step cell homing cascade and the importance of cell homing following systemic delivery of exogenous populations of cells in patients, this system offers potential as a screening platform to improve cell-based therapy.
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09:02
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Cited by 21 •
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We describe a novel method to perform DNA replication via the polymerase chain reaction (PCR). Thermal convection is harnessed to continuously shuttle reagents between denaturing, annealing, and extension conditions by maintaining opposing surfaces of the reactor at constant temperature. This inherently simple design promises to make rapid PCR more accessible.
02:58
Convection-Enhanced Delivery of Antibodies into a Mouse Brain
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This video demonstrates a convection-enhanced delivery (CED) technique for antibody delivery into the mouse brain. The skull of an anesthetized mouse is exposed, and a burr hole is created at the target area for antibody delivery. A step catheter containing antibodies is inserted at the target site, and via an infusion pump, a pressure gradient is created to deliver antibodies at a controlled rate.
07:41
Using a Tray Dryer to Investigate Convective and Conductive Heat Transfer
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Dryers are utilized in numerous industrial processes. The function of a dryer is to use heat transfer processes to dry solids. A variety of dryer types exist. Adiabatic dryers use convection and direct contact with gases to dry solids, whereas non-adiabatic dryers use methods other than heated gas contact to dry1, including conduction, radiation, and radio frequency...
FAQs
Roll formation reflects competition among three effects. Buoyancy generated by the temperature difference drives fluid motion, whereas viscosity resists that motion and thermal diffusion smooths temperature variations. When the imposed temperature gradient exceeds a critical value, buoyancy overcomes these stabilizing effects sufficiently for organized circulation to appear. Changing this balance influences whether motion remains weak, develops into rolls, or becomes less orderly.
The critical temperature gradient marks the transition between a state without organized rolls and one in which circulation can develop. It provides a reference for interpreting experimental observations and simulations because conditions below and above it produce different flow behavior. Comparing the applied gradient with this threshold helps researchers identify the onset of pattern formation and examine subsequent changes in stability.
Researchers commonly examine roll geometry, spacing, and stability because these features describe how the circulation is organized and how it changes. Geometry characterizes the pattern’s form, spacing indicates the separation of neighboring structures, and stability shows whether the arrangement persists. Together, these measurements allow comparisons among observed patterns, simulated flows, and different operating conditions without relying only on visual inspection.
The analysis follows how roll structure and transport behavior change as conditions vary. A persistent geometry and spacing indicate a more steady pattern, while changes in stability can signal departure from that state. At stronger transitions, the organized arrangement may lead toward turbulence. Observations, simulations, and quantitative measurements help connect these visible or calculated changes with evolving flow behavior.
Three approaches identified for this analysis are direct observations, simulations, and quantitative measurements. Observations reveal the evolving pattern, simulations examine behavior under represented conditions, and measurements provide numerical descriptions of geometry, spacing, stability, or transport rates. Using these approaches together can connect the physical appearance of rolls with the underlying flow and heat or mass movement.
Beyond describing the pattern itself, the analysis can quantify transport rates, linking circulation structure to how heat and mass move through a system. Roll geometry and stability provide context for interpreting those rates, while observations or simulations show how transport changes across flow conditions. This makes the method useful for studying the relationship between organized motion and overall system performance.
The approach supports studies of heat transfer, atmospheric and oceanic circulation, geophysical flows, and engineering systems. In each setting, researchers can use roll geometry, stability, and transport rates to examine organized fluid motion and its transitions. Its physics significance extends from controlled Rayleigh-Bénard configurations to larger circulation problems where buoyancy-driven flow affects how energy and matter are redistributed.