Buoyancy Control
Buoyancy Control - Related Videos
11:30
Buoyancy and Drag on Immersed Bodies
0 Views •
2023
Source: Alexander S Rattner and Sanjay Adhikari; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Objects, vehicles, and organisms immersed in fluid mediums experience forces from the surrounding fluid in the form of buoyancy- a vertical upward force due to fluid weight, drag- a resistive force opposite the direction of motion, and lift- a force perpendicular to the direction of motion. Prediction and characterization of these forces is...
01:12
Buoyancy
0 Views •
2025
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy. The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the fluid? To get...
03:18
Flotation-Based T Cell Isolation Using Buoyancy-Activated Cell Sorting
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2025
This video demonstrates T cell isolation from peripheral blood mononuclear cells (PBMCs) using the functionalized buoyancy-activated cell sorting (BACS) technology. The isolation technique involves the positive selection of CD3+ T cells by labeling the cells with biotinylated anti-CD3 antibodies and separating the antibody-bound cells using streptavidin-bound microbubbles.
08:00
A Buoyancy-based Method of Determining Fat Levels in Drosophila
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Cited by 19 •
2016
Here we present a method to measure organismal fat levels in the third instar (L3) larval stage of Drosophila melanogaster. This method exploits the comparatively low density of fat tissue to differentiate between larvae with altered fat stores. Buoyancy-based analysis is a valuable tool for rapid, reproducible, and economical screening.
01:11
Buoyancy and Stability for Submerged and Floating Bodies
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2025
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
FAQs
The buoyant contribution increases with the volume of fluid displaced and the density of that fluid. An object’s behavior therefore depends on how these factors balance its gravitational force. In bioengineering designs, changing volume or material composition can shift this balance, allowing a system to rise, sink, or remain suspended without changing its overall purpose.
These strategies alter different parts of the force balance. Adjustable volume changes the displaced-fluid contribution, ballast changes the system’s gravitational load, and material composition changes how much mass is associated with a given volume. Fluid exchange provides another way to modify the system’s condition. Designers can therefore select the strategy that best supports controlled positioning in liquid environments.
Precise control helps a device maintain a desired position rather than continuously rising or sinking. That stability can support deployment, reduce unnecessary energy demands, and enable more controlled interactions with biological tissues or surrounding water. The same principle is valuable when a system must move through liquid or remain positioned near a specific biological or environmental region.
Movement and suspension require different force-balance outcomes. A design intended to move can adjust its buoyant tendency to support rising or sinking, while a design intended to remain stable must approach a balance between buoyant and gravitational forces. This distinction helps engineers match the control strategy to whether a bioengineered system must navigate through liquid or hold position.
First, determine whether the system should rise, sink, remain suspended, or move through liquid. Next, identify whether adjustable volume, ballast, material composition, or fluid exchange can provide the needed change in force balance. The design can then be evaluated for positioning, deployment, energy demands, and interaction with its biological or aquatic surroundings.
Applications described for this approach include soft robots, underwater medical devices, engineered tissues, and biomimetic systems. In each case, control of positioning in liquid can support a different function, such as navigation, deployment, stability, or interaction with biological tissues. The shared design goal is to manage movement and location without relying solely on continuous active force.