19992019
If you made any changes in Pure these will be visible here soon.

Research Output 1999 2019

2019

A numerical and experimental methodology to investigate morphological changes in wood exposed to fire temperatures

Fortino, S., Rinta-Paavola, A., Pecenko, R., Hozjan, T., Paajanen, A., Vaari, J. & Hostikka, S., 2019, CompWood 2019, Book of Abstracts: International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures, ECCOMAS Thematic Conference . Bader, T. K., Fussl, J. & Olsson, A. (eds.). Växjö, p. 20-20 1 p.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Open Access
Wood
Fires
Pyrolysis
Temperature
Cells
2 Citations (Scopus)

Crystallization of cross-linked polyethylene by molecular dynamics simulation

Paajanen, A., Vaari, J. & Verho, T., 8 May 2019, In : Polymer. 171, p. 80-86 7 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Polyethylene
Crystallization
Molecular dynamics
Polyethylenes
Polymers
2018
7 Citations (Scopus)

Crystal Growth in Polyethylene by Molecular Dynamics: The Crystal Edge and Lamellar Thickness

Verho, T., Paajanen, A., Vaari, J. & Laukkanen, A., 10 Jul 2018, In : Macromolecules. 51, 13, p. 4865-4873 9 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Polyethylene
Crystallization
Crystal growth
Molecular dynamics
Polyethylenes
1 Citation (Scopus)

Evaluation of the reactive molecular dynamics method for Research on flame retardants: ATH-filled polyethylene

Vaari, J. & Paajanen, A., 1 Oct 2018, In : Computational Materials Science. 153, p. 103-112 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Flame Retardants
flame retardants
Polyethylene
Flame retardants
Flame

Molecular simulation of flame retardancy: solid-phase effects of aluminium hydroxide

Vaari, J. & Paajanen, A., 2018. 1 p.

Research output: Contribution to conferenceConference AbstractScientificpeer-review

Hydrated alumina
Flame retardants
Pyrolysis
Aluminum
Molecular dynamics
2017

Building a reactive molecular dynamics framework for cellulose pyrolysis studies

Vaari, J. & Paajanen, A., 2017.

Research output: Contribution to conferenceConference AbstractScientific

Cellulose
Molecular dynamics
Pyrolysis
Decomposition
formic acid

Etanoli-vesiseosten palaminen

Korhonen, T., Hakkarainen, T. & Vaari, J., 2017, In : Pelastustieto: Palontorjuntatekniikka-erikoisnumero. p. 6-10

Research output: Contribution to journalArticleProfessional

Fire risk evaluation and Defence-in-Depth (FIRED)

Matala, A., Sikanen, T., Vaari, J., Paajanen, A., Paudel, D. & Hostikka, S., 2017, SAFIR2018 - The Finnish Research Programme on Nuclear Power Plant Safety 2015-2018: Interim Report. VTT Technical Research Centre of Finland, p. 124-134 (VTT Technology, Vol. 294).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Open Access

Heat Release Characteristics of Ethanol-Water Mixtures: Intermediate and Full Scale Fire Tests

Hakkarainen, T., Korhonen, T. & Vaari, J., 2017, Nordic Fire & Safety Days 2017: Book of Abstracts. RISE Research Institutes of Sweden, 17

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

3 Citations (Scopus)

Heat release characteristics of ethanol-water mixtures: Small-scale experiments

Hakkarainen, T., Korhonen, T. & Vaari, J., 1 Jul 2017, In : Fire Safety Journal. 91, p. 174-181 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Fires
Ethanol
ethyl alcohol
heat
Water

Heat release characteristics of ethanol-water mixtures: Small-scale experiments

Hakkarainen, T., Korhonen, T. & Vaari, J., 2017, 12th International Symposium on Fire Safety Science: Book of Abstracts. p. 23

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Open Access
Fires
Ethanol
Water
Experiments
Retail stores
7 Citations (Scopus)

High-temperature decomposition of the cellulose molecule: a stochastic molecular dynamics study

Paajanen, A. & Vaari, J., 1 Jul 2017, In : Cellulose. 24, 7, p. 2713-2725 13 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Cellulose
Molecular dynamics
Decomposition
Pyrolysis
Molecules
2016

Atomistic modelling of novel fire retardants

Paajanen, A. & Vaari, J., 2016, VTT Technical Research Centre of Finland. (VTT Research Report, Vol. VTT-R-04781-16).

Research output: Book/ReportReport

2015

Carbonization of cellulose fibre precursors: experimental and modelling efforts

Heikkilä, P., Valta, K., Vehviläinen, M., Kamppuri, T., Orell, O., Kakkonen, M., Pasanen, A. T., Honkanen, M., Paajanen, A., Pinomaa, T., Vaari, J., Vippola, M., Vuorinen, J. & Harlin, A., 2015.

Research output: Contribution to conferenceConference articleScientific

cellulosic fibers
cellulose
carbon
carbamates
activated carbon

Carbon materials from bio-based and tailored precursors

Pasanen, A. T., Wikberg, H., Paajanen, A., Pinomaa, T., Vaari, J., Heikkilä, P. & Harlin, A., 2015. 16 p.

Research output: Contribution to conferenceOther conference contributionScientific

Carbonization
Carbon
Raw materials
Carbon nanofibers
Petroleum
18 Citations (Scopus)

Molecular dynamics simulations of vacancy diffusion in chromium(III) oxide, hematite, magnetite and chromite

Vaari, J., 2015, In : Solid State Ionics. 270, p. 10-17

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Ferrosoferric Oxide
Chromite
chromites
Hematite
Magnetite

Pelastusopiston paloteatterin palonsimuloinnit

Vaari, J., 2015, 30 p. (VTT Tutkimusraportti, Vol. VTT-R-03005-15).

Research output: Book/ReportReport

Open Access

Pelastusopiston paloteatterin toimivuuden arviointi

Vaari, J. & Hakkarainen, T., 2015, In : Pelastustieto: Palontorjuntatekniikka-erikoisnumero. p. 96-100

Research output: Contribution to journalArticleProfessional

Open Access
2014

Building a high temperature corrosion and erosion model for thermal spray coatings

Metsäjoki, J., Oksa, M., Vaari, J., Penttilä, K. & Laukkanen, A., 2014, (Submitted) Conference Abstracts (Including manuscripts on CD-ROM). Düsseldorf, p. 836-840

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Erosion
Corrosion
Coatings
Free energy
Molecular dynamics
11 Citations (Scopus)

Modeling and Simulation of High Pressure Water Mist Systems

Sikanen, T., Vaari, J., Hostikka, S. & Paajanen, A., 2014, In : Fire Technology. 50, 3, p. 483-504 22 p.

Research output: Contribution to journalArticleScientificpeer-review

Fog
Water
Fires
Simulators
Orifices
2013

Large scale simulation of high pressure water mist systems

Sikanen, T., Vaari, J. & Hostikka, S., 2013, In : WIT Transactions on Engineering Sciences. 79, p. 77-88

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Fog
Water
Fires
Steam
Large eddy simulation

Molecular dynamics simulations of mass transport in chromium oxide scales

Vaari, J., 2013, Multiscale modelling and design for engineering application. Laitinen, T. & Wallin, K. (eds.). Espoo: VTT Technical Research Centre of Finland, p. 63-77 (VTT Technology; No. 77).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Open Access
chromium oxides
diffusion coefficient
molecular dynamics
ionic diffusion
defects

Numerical simulations on the performance of water-based fire suppression systems

Vaari, J., Hostikka, S., Sikanen, T. & Paajanen, A., 2013, Research highlights in safety and security. Espoo: VTT Technical Research Centre of Finland, p. 42-43 (VTT Research Highlights; No. 10).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Open Access
Fires
Computer simulation
Water
Testing
Simulators

Pelastuslaitoksen ja sprinklerilaitoksen jäähdytyskyvyn simulointi suuressa nestepalossa

Vaari, J., Kling, T., Rinne, T. & Hostikka, S., 2013, In : Pelastustieto: Palontorjuntatekniikka-erikoisnumero. 64, p. 103-107

Research output: Contribution to journalArticle in a proceedings journalProfessional

Open Access

Pelastustilanteiden stokastinen operaatioaikamallinnus

Kling, T., Hostikka, S., Rinne, T. & Vaari, J., 2013, In : Pelastustieto: Palontorjuntatekniikka-erikoisnumero. 64, p. 54-58

Research output: Contribution to journalArticle in a proceedings journalProfessional

Open Access

Sammutuksen ja sammutusjärjestelmien simulointi

Sikanen, T., Hostikka, S. & Vaari, J., 2013, In : Pelastustieto: Palontorjuntatekniikka-erikoisnumero. 64, p. 98-102

Research output: Contribution to journalArticle in a proceedings journalProfessional

Open Access

Simulating the rescue service response in a railway tanker fire

Vaari, J., Kling, T., Hostikka, S., Rinne, T. & Ketola, J., 2013, proceedings of the thirteenth international conference, INTERFLAM 2013. London, UK: Interscience communications, p. 1359-1369

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Stochastic operation time modelling of rescue situations

Kling, T., Hostikka, S., Rinne, T., Vaari, J. & Hakkarainen, T., 2013, Proceedings of the Interflam 2013 Conference. London, UK: Interscience communications, p. 1347-1358

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2012

Numerical simulations on the performance of waterbased fire suppression systems

Vaari, J., Hostikka, S., Sikanen, T. & Paajanen, A., 2012, Espoo: VTT Technical Research Centre of Finland. 144 p. (VTT Technology; No. 54).

Research output: Book/ReportReport

Open Access
Fires
Computer simulation
Water
Simulators
Cooling

Pelastustoimen vasteen simulointi suurpalossa: SIREENI-projektin tulokset

Hostikka, S., Kling, T., Vaari, J., Rinne, T. & Ketola, J., 2012, Espoo: VTT Technical Research Centre of Finland. 98 p. (VTT Technology; No. 61).

Research output: Book/ReportReport

Open Access
2011
12 Citations (Scopus)

CFD simulations on extinction of co-flow diffusion flames

Vaari, J., Floyd, J. & McDermott, R., 2011, In : Fire Safety Journal. 10, p. 781-793

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Open Access
diffusion flames
extinguishing
charge flow devices
flames
Computational fluid dynamics

Water mist spray modelling with FDS

Hostikka, S., Vaari, J., Sikanen, T. & Paajanen, A., 2011, Proceedings, Fire and Evacuation Modeling Technical Conference 2011: Baltimore, Maryland, August 15-16, 2011. 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Open Access
2010

Asuntosprinklaus Suomessa: Vaikuttavuuden arviointi. Osa 2

Vaari, J., Tillander, K., Rinne, T. & Paloposki, T., 2010, Espoo: VTT Technical Research Centre of Finland. 138 p. (VTT Tiedotteita - Research Notes; No. 2527).

Research output: Book/ReportReport

Open Access
2009

Sammutusjärjestelmien suorituskyky asuntopalossa

Paloposki, T., Rinne, T., Tillander, K. & Vaari, J., 2009, Palotutkimuksen päivät 2009. p. 75-79

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

Water mist fire protection systems for industrial cable tunnels and turbine halls

Vaari, J. & Lior, A., 2009. 8 p.

Research output: Contribution to conferenceConference articleScientificpeer-review

Open Access
2008

Asuntosprinklaus Suomessa: Vaikuttavuuden arviointi

Rinne, T., Tillander, K., Vaari, J., Belloni, K. & Paloposki, T., 2008, Espoo: VTT Technical Research Centre of Finland. 88 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2430).

Research output: Book/ReportReport

Open Access
2007

Asuntosprinklaus Suomessa

Tillander, K., Belloni, K., Rinne, T., Vaari, J. & Paloposki, T., 2007, In : Pelastustieto. 58, p. 114-115

Research output: Contribution to journalArticleProfessional

Sammutusjärjestelmät ajoneuvopaloissa

Vaari, J., 2007, In : Pelastustieto. 58, p. 101-105

Research output: Contribution to journalArticleProfessional

2005

Uudet sammutteet ja sammutusteknologiat

Rinne, T. & Vaari, J., 2005, In : Pelastustieto: Palontorjuntatekniikka-erikoisnumero. 56, p. 20-24

Research output: Contribution to journalArticleProfessional

Uudet sammutteet ja sammutusteknologiat: Kirjallisuustutkimus

Rinne, T. & Vaari, J., 2005, Espoo: VTT Technical Research Centre of Finland. 166 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2290).

Research output: Book/ReportReport

Open Access
2004

FDS simulation of fire spread: Comparison of model results with experimental data

Hietaniemi, J., Hostikka, S. & Vaari, J., 2004, Espoo: VTT Technical Research Centre of Finland. 54 p. (VTT Working Papers; No. 4).

Research output: Book/ReportReport

Open Access
Fires
Simulators
Calorimeters
Cones
Cable sheathing

Ontelotilojen paloturvallisuus: Ontelopalojen ominaispiirteet sekä palojen etenemisen rakenteellinen katkaiseminen ja sammuttaminen

Hietaniemi, J., Vaari, J., Hakkarainen, T., Huhta, J., Jumppanen, U-M., Korhonen, T., Kouhia, I., Siiskonen, J. & Weckman, H., 2004, Espoo: VTT Technical Research Centre of Finland. 103 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2249).

Research output: Book/ReportReport

Open Access
Valsartan
Safety
2003

Ontelotilojen paloturvallisuus: Ontelopalojen leviämisen katkaiseminen

Hietaniemi, J., Hakkarainen, T., Huhta, J., Jumppanen, U-M., Kouhia, I., Vaari, J. & Weckman, H., 2003, Espoo: VTT Technical Research Centre of Finland. 228 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2202).

Research output: Book/ReportReport

Open Access
fire safety
fire spread

Vesisumuun perustuvan kaksifaasijärjestelmän mitoittaminen suurten koneistotilojen tilasuojaukseen

Vaari, J., 2003, In : Palontorjuntatekniikka. 33, 3-4, p. 45-48

Research output: Contribution to journalArticleProfessional

2002
26 Citations (Scopus)

A transient one-zone computer model for total flooding water mist fire suppression in ventilated enclosures

Vaari, J., 2002, In : Fire Safety Journal. 37, 3, p. 229-257

Research output: Contribution to journalArticleScientificpeer-review

mist
Fog
enclosure
Enclosures
Fires

Ontelotilojen paloturvallisuus: Ontelopalojen tutkimus kokeellisesti ja mallintamalla

Hietaniemi, J., Hakkarainen, T., Huhta, J., Korhonen, T., Siiskonen, J. & Vaari, J., 2002, Espoo: VTT Technical Research Centre of Finland. 193 p. (VTT Tiedotteita - Research Notes; No. 2128).

Research output: Book/ReportReport

Open Access
2001
5 Citations (Scopus)

A study of total flooding water mist fire suppression system performance using a transient one-zone computer model

Vaari, J., 2001, In : Fire Technology. 37, 4, p. 327-342 16 p.

Research output: Contribution to journalArticleScientificpeer-review

Fog
Fires
Water
Enclosures
Guards (shields)

Experimental Study of the Localized Room Fires: NFSC2 Test Series

Hostikka, S., Kokkala, M. & Vaari, J., 2001, Espoo: VTT Technical Research Centre of Finland. 98 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2104).

Research output: Book/ReportReport

Open Access
Fires
Smoke
Gases
Temperature
Ceilings

Teoreettinen laskentamalli vesisumuihin perustuvalle koneistotilojen palosuojaukselle

Vaari, J., 2001, In : Palontorjuntatekniikka. 31, 3-4, p. 56-59

Research output: Contribution to journalArticleProfessional

2000
1 Citation (Scopus)

Smoke ventilation in operational fire fighting: Part 2. Multi-storey buildings

Vaari, J. & Hietaniemi, J., 2000, Espoo: VTT Technical Research Centre of Finland. 65 p. (VTT Publications; No. 419).

Research output: Book/ReportReport

Open Access
Smoke
Ventilation
Fires
Thermal load
Visibility