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Search Publications by: Jiann C. Yang (Fed)

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Displaying 1 - 25 of 316

An Analysis of Aerosol Dynamics with Diffusion-Limited Growth in a Batch Reactor

December 16, 2024
Author(s)
Jiann Yang, Thomas Cleary, George Mulholland
A set of approximate first-order ordinary differential equations was derived from the general dynamic equation (GDE) to study the aerosol dynamics with homogeneous nucleation and condensational diffusion-limited growth in an isothermal batch reactor. A

On the Design of a Firebrand Generator

October 25, 2024
Author(s)
Jiann Yang
Detailed design principles and calculations based on a generic firebrand generator with configuration commensurate with the NIST Firebrand Generators are provided. The generator is treated as a fluidized-bed reactor operating at the vertical dilute-phase

Measuring Firebrand Heat Flux with a Thin-Skin Calorimeter

July 11, 2023
Author(s)
Amy Mensch, Savannah Wessies, Anthony Hamins, Jiann C. Yang
While the impact of wildland-urban interface fires is growing, firebrand exposure is a significant but not well understood contributor to fire spread. The ignition threat of firebrand exposures can be characterized by measuring the heat transfer of glowing

Experimental Studies on the Heat Flux of Individual Firebrands

March 22, 2023
Author(s)
Amy Mensch, Savannah Wessies, Anthony Hamins, Jiann C. Yang
Every year, thousands of wildfires burn all over the world threatening lives and property in the wildland-urban interface. These wildland-urban interface fires spread by radiation, direct flame contact, or firebrand transport. Firebrand exposures are a

Workshop on Incorporating Climate Change Data in U.S. Building Codes and Standards

March 8, 2023
Author(s)
Jason D. Averill, Therese P. McAllister, Andrew K. Persily, Scott Weaver, James Whetstone, Jiann C. Yang, Michael Kuperberg, Sumant Nigam, Alfredo Ruiz-Barradas
NIST hosted a workshop to advance the availability of climate information sought by organizations developing standards, model building codes, and voluntary certifications by convening interactions between the building codes and climate science communities.

Detection of Smoke From Microgravity Fires

October 12, 2021
Author(s)
D L. Urban, DeVon Griffin, Gary Ruff, Thomas Cleary, Jiann C. Yang, George W. Mulholland, Zeng-guang Yuan
The history and current status of spacecraft smoke detection is discussed including a review of the state of understanding of the effect of gravity on the resultant smoke particle size. The results from a spacecraft experiment (Comparative Soot Diagnostics

A Perspective on Forest Fuel Bed Ignition by Firebrands

February 19, 2021
Author(s)
Jiann C. Yang
A different perspective on forest fuel bed ignition by firebrands is presented to obtain a correlation between the ignition time of a fuel bed by a glowing firebrand and fuel moisture content. A firebrand heating efficiency akin to spray cooling efficiency

Analysis of a Slug Calorimeter with a Curie Point

April 3, 2020
Author(s)
Jiann C. Yang, Thomas J. Ohlemiller
A lump-capacitance heat transfer model was developed to model the operation of a slug calorimeter constructed of metal with a Curie point. The resulting formula has been successfully used to infer total heat flux to a metal structural member in a fire by

On the Cooling of a 360o Video Camera to Observe Fire Dynamics In Situ

December 11, 2019
Author(s)
Jiann C. Yang
An analysis was performed to provide design guidance on the cooling of an NIST-developed in situ fire visualization device, called Burn Observation Bubble (BOB). The analysis was to address the question of how long the device can be operated in a fire

On Correlating Mixed Forest Fuel Bed Fire Spread Data

September 13, 2019
Author(s)
Jiann C. Yang
Mixing rules are proposed and used to correlate well-mixed forest fuel bed fire spread data from the literature using the dimensionless correlations previously developed for single-species forest fuel bed fire spread with the help of dimensional analysis