Flow metrology & rheology

News and Updates

Calibration of a Commercial Rheometer for Orthogonal Superposition Measurement

March 12, 2020

NIST researchers have addressed crucial calibration procedures for an advanced rheological technique that can make

NIST Goes With the (Slow) Flow: New Technique Could Improve Biotech, Precision Medicine

September 26, 2019

Researchers at the National Institute of Standards and Technology (NIST) have developed an optical system that

NIST Presents First Real-World Test of New Smokestack Emissions Sensor Designs

June 26, 2019

In collaboration with industry, researchers at the National Institute of Standards and Technology (NIST) have completed

Assessing the Next-Generation Backing Materials for Body Armor Testing

March 28, 2019

A framework of rheological techniques was developed to evaluate a candidate ballistic witness material developed by the

Projects and Programs

Understanding Flow Meters

Accurate flow measurements are needed for test fluids, temperatures, pressures, flows, and installation conditions that differ from those used during NIST's

Transient Flow Facility

Today, demonstration vehicles are refueled with hydrogen from dispensers within 3 to 5 minutes using sequential gas releases from a bank of pressurized

COMPLETED: Polymer Formulations

Our goal is to develop combinatorial and high-throughput measurement approaches for rapid characterization of the structure and phase behavior of multicomponent

AM Machine and Process Qualification

Machines and processes used to produce critical components for defense, aerospace, and medical applications must first be formally qualified. While

Publications

End Effect Correction for Orthogonal Small Strain Oscillatory Shear in a Rotational Shear Rheometer

February 1, 2020

Author(s)

Ran Tao, Aaron M. Forster

The orthogonal superposition (OSP) technique is advantageous for measuring structural dynamics in complex fluids subjected to a primary shear flow. This

Flow Resistance & Structures in Viscoelastic Channel Flows at Low Re

November 5, 2019

Author(s)

Boyang Qin, Paul Salipante, Steven D. Hudson, Paulo E. Arratia

The flow of viscoelastic fluids in channels and pipes remain poorly understood, particularly at low Reynolds numbers. Here, we investigate the flow of polymeric

Rheology of crystallizing polymers: The role of spherulitic superstructures, gap height, and nucleation densities

November 1, 2019

Author(s)

Debjani Roy, Debra J. Audus, Kalman D. Migler

A longstanding goal in polymer rheology is to develop a physical picture that relates the growth of mechanical moduli during polymer crystallization to that of

Label-free surface acoustic wave-based embedded flow sensor

October 27, 2019

Author(s)

Aurore F. Quelennec, Jason J. Gorman, Darwin R. Reyes-Hernandez

This paper presents a calibration/label-free flow sensor embedded in a microfluidic system. This sensor is based on surface acoustic waves, where the acoustic