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Full-Text Articles in Agriculture
Apparent Thermal Conductivity Of Mulch Materials Exposed To Forced Convection, Simon Van Donk, Ernest W. Tollner
Apparent Thermal Conductivity Of Mulch Materials Exposed To Forced Convection, Simon Van Donk, Ernest W. Tollner
West Central Research and Extension Center, North Platte
Soil temperature controls plant growth and many related processes in the soil. A mulch or crop residue covering the soil may alter soil temperatures significantly. Available simulation models often lack experimental data for the mulch thermal conductivity and its dependence on air velocity. The apparent thermal conductivity (k) of wheat straw, pine straw, tire chips, dry sandy soil, and the thermal resistance of Bermudagrass sods were measured using a guarded hot plate at air velocities between 0 and 5 m/s. For all mulch materials, k ranged between 0.1 and 0.6 W m–1 °C–1, and increased …
Measurement And Modeling Of Heat Transfer Mechanisms In Mulch Materials, Simon Van Donk, Ernest W. Tollner
Measurement And Modeling Of Heat Transfer Mechanisms In Mulch Materials, Simon Van Donk, Ernest W. Tollner
West Central Research and Extension Center, North Platte
Crop residues or mulches affect soil temperature influencing plant growth and related processes in the soil. A hot/cold plate combination was used to quantify heat transfer through several common dry test mulch materials (rubber chips, pine straw, wheat straw) and identify and quantify heat transfer mechanisms with the goal of modeling apparent thermal conductivity of the mulch. Mulch material bulk densities ranged from near 0 kg/m3 to 33 kg/m3 , mulch thickness ranged from 61 mm to 140 mm and test temperatures ranged from 20°C to 45°C. To determine the effect of thermal radiation on heat transfer, measurements …