Diameter Effect
Diameter Effect - Related Videos
11:37
Propeller Characterization: Variations in Pitch, Diameter, and Blade Number on Performance
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2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC A propeller is a twisted airfoil, where the angle of the chord changes with respect to the location, along the radial station, as shown in Figure 1. Propellers are widely used in aircraft and watercraft propulsion systems thereby necessitating detailed characterizations of propellers to design high performance vehicles. Figure 1. Chord, thickness, and pitch at a radial station. One of...
01:17
Design Example: Calculating Safe Diameter for Wind-Exposed Disc
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2025
Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
08:24
Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
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Cited by 17 •
2018
The polysaccharide capsule is the primary virulence factor in Cryptococcus neoformans, and its size correlates with strain virulence. Capsule diameter measurements are used in phenotypic testing and to gauge therapeutic efficacy. Here a standard method of capsule induction is presented, and two methods of staining and measuring diameter are compared.
04:04
Measuring Retinal Vessel Diameter from Mouse Fluorescent Angiography Images
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Cited by 2 •
2023
Mouse retinal vasculature is particularly interesting in understanding the mechanisms of vascular pattern formation. This protocol automatically measures the diameter of mouse retinal vessels from fluorescent angiography fundus images at a fixed distance from the optic disk.
04:16
Using Spectral Reflectometry to Determine Myelinated Axon Diameters in a Fixed Mouse Brain Slice
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2025
Source: Kwon, J., et al., Spectral Reflectometric Microscopy on Myelinated Axons In Situ. J. Vis. Exp. (2018) This video demonstrates the use of spectral reflectometry with a hyperspectral confocal microscope to analyze interference patterns and determine myelinated axon diameters in fixed brain tissue slices.
FAQs
For a component loaded through its cross section, increasing diameter expands the area available for load transfer according to a squared relationship. Consequently, a proportional diameter increase can create a greater proportional increase in the participating area. Engineers must recalculate capacity rather than assume that performance changes in direct proportion to diameter.
Changing diameter alters how an applied load is distributed through a shaft or structural member and can change the resulting deformation. These effects influence whether a component meets requirements for strength, stiffness, safety, and reliability. Diameter selection therefore requires evaluating both the load carried and the way the member responds under that load.
A change in diameter modifies the relationship between a component’s exposed surface and its internal volume. That shift affects how much surface is available relative to the material or fluid contained within the component, influencing heat or mass transfer behavior. Engineers consider this effect when diameter changes alter thermal or mass-transfer performance.
For a given volumetric flow rate, a larger pipeline diameter generally reduces resistance to flow. Engineers can therefore use diameter as a design variable when balancing flow performance with the requirements of the engineered system. The selected size must reflect the desired fluid behavior while satisfying broader efficiency, safety, and reliability objectives.
They should reassess the component’s load behavior, stress distribution, and deformation rather than evaluate diameter only as a dimensional change. These checks show whether the revised member remains suitable for its intended duty. The results support decisions about safety and reliability, particularly when the component’s performance depends on how loads move through its cross section.
Engineers can compare the resulting cross-sectional area, volume, surface-to-volume relationship, and expected operating behavior. For pipes, flow resistance is important; for shafts and structural members, stress distribution and deformation matter. Considering these effects together helps determine whether a diameter revision improves efficiency and performance without compromising design requirements.