Airflow resistance measurements between room temperature and 800?

Samarasinghe, T, Hopkins, C ORCID: 0000-0002-9716-0793, Seiffert, G ORCID: 0000-0003-0268-7056 and Knox, J (2019) Airflow resistance measurements between room temperature and 800? .

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Abstract

Acoustic properties of porous materials are usually measured at room temperature but in many industries, they are required to provide sound absorption in high temperature applications such as in a Heat Recovery Steam Generator (HRSG), automobile silencers and engine liners. In this paper, the airflow resistance has been measured for Alkaline Earth Silicate (AES) fibrous materials that are intended for high temperature applications. Measurements were made at room temperature to ISO 9053-1 and in a bespoke test rig at temperatures up to 800? inside a kiln. Above 600? the thickness of the AES material decreased; hence the measurements reported the specific airflow resistance rather than airflow resistivity. The high temperature tests indicated that it might be possible to assume no significant effect of temperature on specific airflow resistance between 20 and 100 ? but not at higher temperatures. The specific airflow resistance depends on the mass of the sample up to 800?. Up to 600?, the dependence is similar but as the AES material begins to crystallize between 600 and 800? it changes significantly. Regression analysis was also used to establish that up to 600? the specific airflow resistance is proportional to the absolute temperature to the power of 1.6.

Item Type:	Conference or Workshop Item (Unspecified)
Depositing User:	Symplectic Admin
Date Deposited:	25 Jan 2021 16:05
Last Modified:	18 Jan 2023 23:02
DOI:	10.18154/RWTH-CONV-239401
Open Access URL:	http://publications.rwth-aachen.de/record/769812
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3114726