Modification of water vapor diffusion in poplar wood (Populus nigra L.) by steaming at high temperatures

SAYAR, MAEDEH

doi:10.3906/tar-1206-23

Cited by 2 publications

(6 citation statements)

References 9 publications

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“…Ma et al (2016) claimed that the large capillary system of microexplosion-treated samples was broadened and resulted in a decreased resistance to moisture flow. However, research by Sayar and Tarmian (2013) reported that neither temperature nor treatment time had any effect on water-vapor diffusion coefficients for poplar samples because the treated samples showed lower water-vapor diffusion coefficients.…”

mentioning

confidence: 97%

“…In addition to improvement of the drying process itself, numerous studies have been devoted to treating wood prior to drying. For example, to improve physical properties and decay resistance of wood, several treatments have been explored, including high-pressure steam (Dashti et al 2012a(Dashti et al , 2012bPeng et al 2012;Sayar and Tarmian 2013), steam explosion (Zhang and Cai 2006), ultrasonic treatment (He et al 2013(He et al , 2014, and heat treatment (Rousset et al 2004). Dashti et al (2012a) reported that microwave treatment on aleppo oak (Quercus infectoria) successfully eliminated the tyloses structure and improved air permeability.…”

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confidence: 99%

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Effect of Different Hydrothermal Treatments (Steam and Hot Compressed Water) on Physical Properties and Drying Behavior of Yellow-Poplar (Liriodendron tulipifera)

Rahimi¹,

Singh²,

DeVallance

2019

Forest Products Journal

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Nonchemical high-pressure steam treatments have been intensively researched and commercialized to produce chemical-free wood products with enhanced properties. However, the utilization of high-pressure steam involves vapor-phase reactions using high-temperature steam generated at the expense of high energy input. In this research, influences of reaction media (steam and hot-compressed water) and temperature (100°C and 140°C) during thermal treatment on physical properties and drying behavior of yellow-poplar (Liriodendron tulipifera) heartwood were compared. The length, width, and thickness of the samples were 22.53 mm, 17.18 mm, and 16.72 mm, respectively. After the treatment, the samples were dried under an isothermal temperature condition of 105°C. Data on moisture content and time of drying from drying experiments were fitted with unsteady-state molecular transport equations to calculate overall liquid diffusion coefficients. Dimensions, weight, and true volume of samples were measured for green, thermally treated, and dried samples and the values were used to calculate selected physical characteristics. Additionally, selected mechanical properties were evaluated for samples conditioned to 13 percent moisture content. Results showed that intensified hot-compressed water-treated and control samples had the highest and lowest saturated moisture contents (101% and 44%), respectively, immediately after treatments. Intensified steam-treated and control samples had the highest and lowest total porosity (95% and 82%), respectively. Furthermore, mild hot-compressed water-treated samples showed the greatest compression strength (47.8 MPa) at 13 percent moisture content. Except for steam treatment at 140°C, other treatments significantly decreased the diffusion coefficient. Collectively, samples treated with hot-compressed water at 100°C showed the most improved mechanical properties.

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mentioning

confidence: 97%

mentioning

confidence: 99%

Effect of Different Hydrothermal Treatments (Steam and Hot Compressed Water) on Physical Properties and Drying Behavior of Yellow-Poplar (Liriodendron tulipifera)

Rahimi¹,

Singh²,

DeVallance

2019

Forest Products Journal

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“…To improve physical properties (water absorption, dimensional stability, permeability and diffusivity, and mechanical strength) and decay resistance of wood, several treatments, for example, high-pressure steam (Dashti et al, 2012 a;Dashti et al, 2012 b;Sayar and Tarmian, 2013;and Peng et al, 2012), steam explosion (Zhang and Cai, 2006), ultrasonic treatment (He et al, 2013 andHe et al, 2014), heat treatment (Rousset et al, 2011) have been reported.…”

Section: Various Physical Treatments Performed On Woodmentioning

confidence: 99%

“…Different types of hydrothermal treatment were applied to improve wood quality and drying process and consequently reduce energy consumption. Following are some examples: steam treatment (Peng et al, 2012;Sayar and Tarmian, 2013;Alexiou et al, 1990;and Dashti et al (2012a), steam explosion (Cai, 2006 andKanagawa, 1992), and micro-explosion (Ma et al, 2015).…”

Section: Hydrothermal Treatmentsmentioning

confidence: 99%

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Physical Properties and Drying Behavior of Hydrothermally Treated Yellow-Poplar

Rahimi¹

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Non-chemical treatments (steam and ultrasonic vibrations) have been intensively researched and commercialized to make chemical-free wood products with enhanced mechanical properties and decay resistance; however, utilization of high-pressure steam medium involves vapor-phase reactions using high-temperature steam generated at the expense of high energy input. In this research, drying behavior, mechanical properties, and physical characteristics of wood (yellowpoplar) were compared to evaluate influence of reaction media (steam and hot-compressed water) and temperatures (100°C and 140°C). The control (no treatment) was used for reference comparison. For experiments, green samples of yellow-poplar heartwood were used for treatment. v

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Modification of water vapor diffusion in poplar wood (Populus nigra L.) by steaming at high temperatures

Cited by 2 publications

References 9 publications

Effect of Different Hydrothermal Treatments (Steam and Hot Compressed Water) on Physical Properties and Drying Behavior of Yellow-Poplar (Liriodendron tulipifera)

Effect of Different Hydrothermal Treatments (Steam and Hot Compressed Water) on Physical Properties and Drying Behavior of Yellow-Poplar (Liriodendron tulipifera)

Physical Properties and Drying Behavior of Hydrothermally Treated Yellow-Poplar

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