נגישות

תפריט נגישות

ניגודיות עדינהניגודיות גבוההמונוכרוםהדגשת קישוריםחסימת אנימציהפונט קריאסגוראיפוס הגדרות נגישותלהורדת מודול נגישות חינםניהול

קהילה:

אסיף מאגר המחקר החקלאי

Semianalytical solution for dual-probe heat- pulse applications that accounts for probe radius and heat capacity

Year:

2012

Source of publication :

Vadose Zone JournalAuthors :

קמאי, תמיר

;

.

Volume :

11

Co-Authors:

Knight, J.H., Faculty of Science and Technology, Queensland Univ. of Technology, Brisbane, QLD 4001, Australia

Kluitenberg, G.J., Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506, Australia

Kamai, T., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Hopmans, J.W., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Kluitenberg, G.J., Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506, Australia

Kamai, T., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Hopmans, J.W., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Facilitators :

From page:

To page:

(

Total pages:

1

)

Abstract:

The dual-probe heat-pulse (DPHP) method is useful for measuring soil thermal properties. Measurements are made with a sensor that has two parallel cylindrical probes: one for introducing a pulse of heat into the soil (heater probe) and one for measuring change in temperature (temperature probe). We present a semianalytical solution that accounts for the finite radius and finite heat capacity of the heater and temperature probes. A closed-form expression for the Laplace transform of the solution is obtained by considering the probes to be cylindrical perfect conductors. The Laplacedomain solution is inverted numerically. For the case where both probes have the same radius and heat capacity, we show that their finite properties have equal influence on the heat-pulse signal received by the temperature probe. The finite radius of the probes causes the heat-pulse signal to arrive earlier in time. This time shift increases in magnitude as the probe radius increases. The effect of the finite heat capacity of the probes depends on the ratio of the heat capacity of the probes (C0) and the heat capacity of the soil (C). Compared with the case where C0/C = 1, the magnitude of the heat-pulse signal decreases (i.e., smaller change in temperature) and the maximum temperature rise occurs later when C0/C > 1. When C0/C < 1, the magnitude of the signal increases and the maximum temperature rise occurs earlier. The semianalytical solution is appropriate for use in DPHP applications where the ratio of probe radius (α0) and probe spacing (L) satisfies the condition that a0/L ≤ 0.11. © Soil Science Society of America.

Note:

Related Files :

Laplace-domain solution

measurement method

Semi-analytical solution

Soils

soil temperature

עוד תגיות

תוכן קשור

More details

DOI :

Article number:

Affiliations:

Database:

סקופוס

Publication Type:

מאמר

;

.

Language:

אנגלית

Editors' remarks:

ID:

20990

Last updated date:

02/03/2022 17:27

Creation date:

16/04/2018 23:40

You may also be interested in

Scientific Publication

Semianalytical solution for dual-probe heat- pulse applications that accounts for probe radius and heat capacity

11

Knight, J.H., Faculty of Science and Technology, Queensland Univ. of Technology, Brisbane, QLD 4001, Australia

Kluitenberg, G.J., Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506, Australia

Kamai, T., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Hopmans, J.W., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Kluitenberg, G.J., Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506, Australia

Kamai, T., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Hopmans, J.W., Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616, Australia

Semianalytical solution for dual-probe heat- pulse applications that accounts for probe radius and heat capacity

The dual-probe heat-pulse (DPHP) method is useful for measuring soil thermal properties. Measurements are made with a sensor that has two parallel cylindrical probes: one for introducing a pulse of heat into the soil (heater probe) and one for measuring change in temperature (temperature probe). We present a semianalytical solution that accounts for the finite radius and finite heat capacity of the heater and temperature probes. A closed-form expression for the Laplace transform of the solution is obtained by considering the probes to be cylindrical perfect conductors. The Laplacedomain solution is inverted numerically. For the case where both probes have the same radius and heat capacity, we show that their finite properties have equal influence on the heat-pulse signal received by the temperature probe. The finite radius of the probes causes the heat-pulse signal to arrive earlier in time. This time shift increases in magnitude as the probe radius increases. The effect of the finite heat capacity of the probes depends on the ratio of the heat capacity of the probes (C0) and the heat capacity of the soil (C). Compared with the case where C0/C = 1, the magnitude of the heat-pulse signal decreases (i.e., smaller change in temperature) and the maximum temperature rise occurs later when C0/C > 1. When C0/C < 1, the magnitude of the signal increases and the maximum temperature rise occurs earlier. The semianalytical solution is appropriate for use in DPHP applications where the ratio of probe radius (α0) and probe spacing (L) satisfies the condition that a0/L ≤ 0.11. © Soil Science Society of America.

Scientific Publication

You may also be interested in