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<p>The present study evaluated the drying performance of <i>Mangifera indica</i> (mango) wood using Radio-Frequency Vacuum (RFV) technology, with emphasis on drying kinetics, moisture distribution, microstructural changes, and physico-mechanical properties. Two drying protocols were followed: Run 1 [8&#xa0;min radio frequency (RF) heating, 2&#xa0;min idle period] and Run 2 (16&#xa0;min RF heating, 4&#xa0;min idle period). Moisture content decreased from 75 to 12% within 10.5&#xa0;h in Run 1, and from 85 to 10% in 13&#xa0;h in Run 2, corresponding to drying rates of 6.0%/h and 5.77%/h. Both treatments maintained highly consistent moisture distribution throughout the plank thickness, although defects such as bowing, twisting, and case hardening were observed. Microscopic examination revealed localized deformation in vessel elements and ray cells, attributed to internal vapor pressure during RFV drying. Despite these changes, key physical and mechanical properties including density, modulus of elasticity (MOE), modulus of rupture (MOR), and compressive strength (parallel and perpendicular to the grain) remained largely unaffected. The results demonstrate that RFV-drying ensures rapid and uniform moisture removal in non-refractory hardwoods without adversely affecting their microstructural or physico-mechanical characteristics.</p>

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Radio-frequency vacuum drying of Mangifera indica wood: insights into drying kinetics, microstructural changes and physico-mechanical properties

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Kamal Mishra,
  • Rohit Sharma,
  • Anil Kumar Sethy,
  • Manoj Kumar Dubey,
  • Satyen Das,
  • Shailesh Namdev Patil,
  • Dharmesh Verma

摘要

The present study evaluated the drying performance of Mangifera indica (mango) wood using Radio-Frequency Vacuum (RFV) technology, with emphasis on drying kinetics, moisture distribution, microstructural changes, and physico-mechanical properties. Two drying protocols were followed: Run 1 [8 min radio frequency (RF) heating, 2 min idle period] and Run 2 (16 min RF heating, 4 min idle period). Moisture content decreased from 75 to 12% within 10.5 h in Run 1, and from 85 to 10% in 13 h in Run 2, corresponding to drying rates of 6.0%/h and 5.77%/h. Both treatments maintained highly consistent moisture distribution throughout the plank thickness, although defects such as bowing, twisting, and case hardening were observed. Microscopic examination revealed localized deformation in vessel elements and ray cells, attributed to internal vapor pressure during RFV drying. Despite these changes, key physical and mechanical properties including density, modulus of elasticity (MOE), modulus of rupture (MOR), and compressive strength (parallel and perpendicular to the grain) remained largely unaffected. The results demonstrate that RFV-drying ensures rapid and uniform moisture removal in non-refractory hardwoods without adversely affecting their microstructural or physico-mechanical characteristics.