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Density

Density

Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...

Density and Archimedes' Principle

Density and Archimedes' Principle

When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The reason...

Current Density

Current Density

The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...

Density, Specific Weight, Specific Gravity and Compressibility of Fluid

Density, Specific Weight, Specific Gravity and Compressibility of Fluid

Density, specific weight, specific gravity, and compressibility are fundamental properties of fluids. Density is the mass per unit volume, characterizing the mass of a fluid system. It influences buoyancy, pressure, flow dynamics, viscosity, thermal conductivity, and sound propagation. For instance, in pipeline design, accurate density measurements ensure that the pipeline can handle the fluid's mass.
Specific weight represents the weight per unit volume and is calculated by multiplying density...

Uniform Depth Channel Flow

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...

Uniform Depth Channel Flow: Problem Solving

Uniform Depth Channel Flow: Problem Solving

To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...

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Related Experiment Video

Updated: Jun 17, 2026

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

Direct density measurements from intersectional FLDI.

Elizabeth K Benitez, Nicholas J Bisek, Douglas W Carter

|June 15, 2026

Summary

This summary is machine-generated.

Intersectional FLDI (iFLDI) improves optical density measurements by using multiple lasers to filter out noise. This novel technique overcomes limitations of focused laser differential interferometry (FLDI) for accurate flow diagnostics.

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Area of Science:

Fluid Dynamics
Optical Diagnostics
Turbulence Research

Background:

Focused Laser Differential Interferometry (FLDI) is widely used but struggles with off-axis noise, complicating density unit conversion.
Longer wavelength off-axis disturbances are integrated into FLDI measurements, limiting accuracy.

Purpose of the Study:

To introduce and computationally validate a novel technique, intersectional FLDI (iFLDI), to overcome FLDI limitations.
To enable accurate quantitative density measurements in turbulent flows.

Main Methods:

Developed intersectional FLDI (iFLDI) using two or more intersecting FLDI systems.
Leveraged coherence between FLDIs to identify and remove off-axis noise.
Employed high-fidelity simulations of hypersonic turbulent flow with and without sinusoidal disturbances.

Main Results:

iFLDI successfully identified and removed contaminating off-axis noise.
The improved iFLDI spectrum approached an idealized point measurement in spectral shape and amplitude.
Quantitative density change measurements were achieved without previous calibration drawbacks.

Conclusions:

iFLDI significantly enhances the accuracy of optical density measurements compared to single FLDI.
This method offers a robust solution for precise flow diagnostics in challenging environments.
iFLDI represents a significant advancement in overcoming noise limitations in laser-based interferometry.