Movement of water drops in a forest fuel layer in the course of its thermal decomposition

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6 Citations (Scopus)

Abstract

In this paper, we conducted an experimental investigation on water droplets gravitating in a layer of typical forest fuel (as illustrated by pine needle litter) in the course of its thermal decomposition. We used a high-speed (200 fps) video recording system, Tema Automotive software with continuous tracking of a mov-ing object as well as a set of low-inertia (no more than 0.1 second) thermocou-ples. Similar experiments were performed at moderate temperatures (below the onset temperature of forest fuel pyrolysis, i. e. about 300 K). Two approaches were used: continuous tracking of a moving water droplet using high-speed video recording and registration of a droplet path using the readings of thermocouples placed at different levels in a forest fuel layer. We determined the typical depths of an forest fuel layer that water droplets reach with the initial volume of these droplets ranging from 90 to 900 μL. The typical velocities of water droplets were calculated at different depths of the forest fuel layer. We also determined the share of the mass of water spent in an forest fuel layer on evaporation and cool-ing of the material down to the temperatures below those of thermal decomposi-tion. Finally, we identified the physical processes influencing water droplets moving through the layers of forest fuel heated up to the high temperatures simi-lar to those of thermal decomposition.

Original languageEnglish
Pages (from-to)301-312
Number of pages12
JournalThermal Science
Volume22
Issue number1
DOIs
Publication statusPublished - 2018

Keywords

  • Forest fuel layer
  • Penetration depth
  • Progress
  • Pyrolysis
  • Thermal decomposition
  • Water droplet

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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