Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch

This study investigated the time based spray evolution of chemically modified tapioca starch through three full cone nozzles namely FC-2, FC-3 and FC-3.5. The objective was to study the effect of temperature, viscosity and nozzle orifice diameter on spatio-temporal droplet size-velocity profiles of...

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Main Authors: Naz, M.Y., Sulaiman, S.A., Man, Z.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.31623 /
Published: AAGR Aerosol and Air Quality Research 2015
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84942241157&doi=10.4209%2faaqr.2015.02.0122&partnerID=40&md5=d0c3a34fd3100248ad909b3f8d2d6bf1
http://eprints.utp.edu.my/31623/
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spelling utp-eprints.316232022-03-26T03:24:18Z Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch Naz, M.Y. Sulaiman, S.A. Man, Z. This study investigated the time based spray evolution of chemically modified tapioca starch through three full cone nozzles namely FC-2, FC-3 and FC-3.5. The objective was to study the effect of temperature, viscosity and nozzle orifice diameter on spatio-temporal droplet size-velocity profiles of the sprayed material. Owing to high viscosity, the unheated spraying medium did not exhibit any breakup over time. However, pre-spray heating of the medium at 80°C caused immediate sheet breakup near nozzle exit point at injection pressure of 5 bar. The spray growth from FC-2 was relatively faster than other tested nozzles; the unstable sheet disintegrated into fully developed spray patterns after 250 ms of the injection time. Unlike FC-2, the jet from FC-3 and FC-3.5 exhibited steady breakup at early and late injection stages, however, relatively fast breakup was seen in the middle part of the spray stream. Phase Doppler Anemometry (DualPDA) data showed a linear increase in Sauter Mean Diameter (SMD) with orifice size. At 140 mm downstream, the smallest SMD of 59 µm was obtained with FC-2 nozzle followed by FC-3 (65 µm) and FC-3.5 (83 µm). The overall SMD was decreased by 44.7 with an increase in orifice diameter from 1.19 to 1.59 mm. The droplet velocity in axial direction dropped sharply with time in the range of 100 to 300 ms, thereafter showed negligible decrease over time. Unlike this, the droplet velocity in the radial direction was dropping appreciably even after 300 ms of injection time. © Taiwan Association for Aerosol Research. AAGR Aerosol and Air Quality Research 2015 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-84942241157&doi=10.4209%2faaqr.2015.02.0122&partnerID=40&md5=d0c3a34fd3100248ad909b3f8d2d6bf1 Naz, M.Y. and Sulaiman, S.A. and Man, Z. (2015) Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch. Aerosol and Air Quality Research, 15 (5). pp. 1699-1711. http://eprints.utp.edu.my/31623/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description This study investigated the time based spray evolution of chemically modified tapioca starch through three full cone nozzles namely FC-2, FC-3 and FC-3.5. The objective was to study the effect of temperature, viscosity and nozzle orifice diameter on spatio-temporal droplet size-velocity profiles of the sprayed material. Owing to high viscosity, the unheated spraying medium did not exhibit any breakup over time. However, pre-spray heating of the medium at 80°C caused immediate sheet breakup near nozzle exit point at injection pressure of 5 bar. The spray growth from FC-2 was relatively faster than other tested nozzles; the unstable sheet disintegrated into fully developed spray patterns after 250 ms of the injection time. Unlike FC-2, the jet from FC-3 and FC-3.5 exhibited steady breakup at early and late injection stages, however, relatively fast breakup was seen in the middle part of the spray stream. Phase Doppler Anemometry (DualPDA) data showed a linear increase in Sauter Mean Diameter (SMD) with orifice size. At 140 mm downstream, the smallest SMD of 59 µm was obtained with FC-2 nozzle followed by FC-3 (65 µm) and FC-3.5 (83 µm). The overall SMD was decreased by 44.7 with an increase in orifice diameter from 1.19 to 1.59 mm. The droplet velocity in axial direction dropped sharply with time in the range of 100 to 300 ms, thereafter showed negligible decrease over time. Unlike this, the droplet velocity in the radial direction was dropping appreciably even after 300 ms of injection time. © Taiwan Association for Aerosol Research.
format Article
author Naz, M.Y.
Sulaiman, S.A.
Man, Z.
spellingShingle Naz, M.Y.
Sulaiman, S.A.
Man, Z.
Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch
author_sort Naz, M.Y.
title Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch
title_short Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch
title_full Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch
title_fullStr Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch
title_full_unstemmed Time function DualPDA study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch
title_sort time function dualpda study of spray growth and droplet size-velocity profiles of chemically modified tapioca starch
publisher AAGR Aerosol and Air Quality Research
publishDate 2015
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-84942241157&doi=10.4209%2faaqr.2015.02.0122&partnerID=40&md5=d0c3a34fd3100248ad909b3f8d2d6bf1
http://eprints.utp.edu.my/31623/
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score 11.62408

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