Show simple item record

dc.contributor.authorLee, So-Jung
dc.contributor.authorChoi, Jung Chan
dc.contributor.authorBaek, Seunghun
dc.contributor.authorKwon, Tae-Huyk
dc.contributor.authorRyu, Hee-Hwan
dc.contributor.authorSong, Ki-Il
dc.date.accessioned2017-01-03T09:39:01Z
dc.date.available2017-01-03T09:39:01Z
dc.date.issued2016
dc.identifier.citationEnergies 2016, 9(10)
dc.identifier.issn1996-1073
dc.identifier.urihttp://hdl.handle.net/11250/2426098
dc.description.abstractThe thermal needle probe method, which is widely used for measuring the thermal conductivity λ of soils, deploys a long and thin metallic probe that houses a line heater and a temperature sensor. However, inserting such probes into consolidated or densely compacted soils or rocks is difficult, frequently causing buckling of the probe and severe disturbance to the surrounding ground, leading to unreliable measurements. We found that the use of a pre-drilled hole filled with thermally conductive grease for installing a thermal needle probe was feasible to overcome such challenges, and still yielded reliable measurements of thermal conductivity. The proposed method, i.e., the pre-drilling thermal needle probe method, was verified by finite element calculations and laboratory experiments by varying various parameters, such as the pre-drilled hole diameter, probe diameter, and thermal conductivity of thermal grease. It was observed that increases in the pre-drilled hole diameter and probe diameter and a decrease in the thermal conductivity of the thermal grease caused delays in temperature increase owing to the slowed heat transfer. Nevertheless, all the estimated λ values agreed well with the reference λ values with acceptable errors. Thus, the proposed method yields reliable measurements and can be applied for a wide range of soils from compacted soils to hard rocks.
dc.language.isoeng
dc.titleUse of a Pre-Drilled Hole for Implementing Thermal Needle Probe Method for Soils and Rocks
dc.typeJournal article
dc.date.updated2016-12-22T10:46:26Z
dc.identifier.doi10.3390/en9100846
dc.identifier.cristin1416721


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record