The trail of perfumes

Abstract

A methodology is proposed for modeling the diffusion of fragrances released from a moving source. First, we started with a one‐dimensional model considering molecular diffusion of α‐pinene in air as the only mass transport mechanism. The validation was performed in a diffusion tube, and a system was developed to move the scented source along the axial direction. Results showed that experimental data fitted well with the numerical simulation, suggesting this model as a valid tool to describe the trail of a fragrance released from a moving source for low Re of the order of 10. In the case of a person walking at the speed of 1.34 m/s in a room or corridor inside a building, three‐dimensional models are required and mass transport of the perfume to the surrounding air will be dominated by turbulent diffusion or eddy diffusion Dt which is two orders of magnitude higher than molecular diffusion. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2890–2897, 2018

Perfume and Flavor Engineering: A Chemical Engineering Perspective

“…It is determined by how long a fragrance travels away and diffuses around the wearer [ 47 ]. We tackled this problem by first analyzing the diffusion of fragrances released from a moving source [ 48 ]. First, we started with a 1D model considering molecular diffusion of a fragrance molecule (α-pinene) in the air as the only mass transport mechanism.…”

On the production and release of Hedychium coronarium essential oil from nanoformulations

“…The release and diffusion experiments were carried out in a Stefan tube similar to that described by Pereira et al (2018). The diffusion tube is 2 m long and has sampling ports (SP) with PTFE septa at different distances from the tube base where the sample is located (gas-liquid interface), and it was kept in an environment with a controlled temperature of 25 • C. The SP heights and the whole apparatus are presented in Fig.…”

Radial diffusion model for fragrance materials: Prediction and validation

“…However, as the propagation of a fragrance occurs in all directions, a more realistic description of the phenomenon is achieved with a three‐dimensional representation. Two recent theoretical approaches were proposed: the first regarding cartesian coordinates 11 and the latter from a theoretical radial perspective 3 . Pereira et al 11 focused on the trail of perfumes, analyzing its diffusion from a moving source, with 1‐D validation.…”

“…Two recent theoretical approaches were proposed: the first regarding cartesian coordinates 11 and the latter from a theoretical radial perspective 3 . Pereira et al 11 focused on the trail of perfumes, analyzing its diffusion from a moving source, with 1‐D validation. Pereira et al 3 presented a theoretical radial model for the fragrance diffusion, based on a numerical correlation to the cartesian one‐dimensional model.…”