Thermal tips for ice hot-point drilling: Experiments and preliminary thermal modeling

Pavel Talalay; Li Yazhou; Mikhail Sysoev; Hong Jialin; Li Xiao; Xiaopeng Fan

doi:10.1016/J.COLDREGIONS.2019.01.015

Thermal tips for ice hot-point drilling: Experiments and preliminary thermal modeling

Published on Apr 1, 2019in Cold Regions Science and Technology3.726

· DOI :10.1016/J.COLDREGIONS.2019.01.015

Pavel Talalay13

Estimated H-index: 13

(JLU: Jilin University), Li Yazhou5

Estimated H-index: 5

(JLU: Jilin University)+ 3 AuthorsXiaopeng Fan8

Estimated H-index: 8

(JLU: Jilin University)

Source

Abstract

Abstract Electrically heated hot points are widely used for drilling in glaciers and ice sheets. To study the effect of input power, axial load, ice temperature, shape, and material of the thermal tip on the hot-point rate of penetration (ROP), a 0.8-m-long drill with 18 changeable thermal tips was designed. The ROP increased with input power for all the thermal tips. Seven tip shapes (cylinder, cosine, ogive, sphere, catenary, parabola, and cone) were tested at the same power level, axial load, and ice temperature, and they exhibited the same ice contact area. The 60° cone-shaped tip demonstrated the highest ROP. The horizontal ring and longitude grooves on the surface of the thermal tips did not improve the drilling performance. The ROP decreased linearly with decreasing ice temperature. Increases in the axial load resulted in increase in the ROP only within the limited range (

References (24)

Citations (7)

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#2Julia Kowalski (RWTH Aachen University)H-Index: 15

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Cited By7

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Modeling of hot-point drilling in ice

Sep 1, 2021·Annals of Glaciology2.43

#1Li YazhouH-Index: 5

#2Pavel TalalayH-Index: 13

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Hot-point drills have been widely used for drilling boreholes in glaciers, ice caps and ice sheets. A hot-point drill melts ice through the thermal head at its bottom end. Penetration occurs through a close-contact melting (CCM) process, in which the ice is melted, and the meltwater is squeezed out by the exerted force applied on the thermal head. During the drilling, a thin water film is formed to separate the thermal head from the surrounding ice. For the hot-point drill, the rate of penetrati...more

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Ice drilling system with near-bottom hot water circulation

Jun 1, 2021·Polar Science1.93

#1Pavel Talalay (JLU: Jilin University)H-Index: 13

#2Zhao Gaoli (JLU: Jilin University)H-Index: 1

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Abstract Ice drilling systems with near-bottom hot water circulation can be used for many challenging scientific tasks in the study of ice sheets, glaciers, and subglacial environments. These systems melt ice using water jets heated directly at the bottom of the hole, thus eliminating the use of long heavy hoses and surface pumps. To investigate the influence of the drill tip shape and nozzle diameter on the drilling process, a simplified laboratory prototype of the drill was designed and tested...more

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Numerical Investigation on the Evolution of Thin Liquid Layer and Dynamic Behavior of an Electro-Thermal Drilling Probe during Close-Contact Heat Transfer

Apr 12, 2021·Applied Sciences

#1Chan Ho JeongH-Index: 4

#2Kwangu KangH-Index: 5

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An efficient melting probe for glacial research

Apr 1, 2021·Annals of Glaciology2.43

#1Dirk HeinenH-Index: 25

#2Peter LinderH-Index: 9

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Mar 1, 2021·Journal of Mechanical Science and Technology1.73

#1Ui-Joon Park (CAU: Chung-Ang University)

#2Kwangu KangH-Index: 5

Last. Seong Hyuk Lee (CAU: Chung-Ang University)H-Index: 18

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The present study aims to numerically investigate the thermal characteristics of the drilling probe for glacier-ice exploration with consideration of close-contact heat transfer between the electro-thermal probe and the ice. The commercial program of Ansys Fluent (v.17.2) was used, and the enthalpy porosity method was adopted for simulating the phase change heat transfer. The dynamic layering method was also used to move the computational mesh with a given speed for understanding the correlation...more

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Power consumption of a Philberth thermal probe in ice sheet exploration

Sep 1, 2020·Cold Regions Science and Technology3.73

#1Li Yazhou (JLU: Jilin University)H-Index: 5

#2Yang Yang (JLU: Jilin University)H-Index: 3

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Hot-Point Drills

#1Pavel Talalay (JLU: Jilin University)H-Index: 13

Hot-points are designed for producing boreholes without a core by melting ice and used to install ablation sticks, to determine ice thickness, to locate englacial and subglacial streams, to deploy sensors and tools under ice shelves, to measure temperatures and closure rates of glaciers, to study subglacial environment in Earth and other planets. The energy for the melting tip heater is provided by a hot fluid that is pumped down using hoses in a closed circuit or by electricity transported via ...more

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