Investigating of heat conductivity equation with consideration of phase change and effect of soil moisture on heat diffusivity

Year 2018, Volume: 33 Issue: 3, 261 - 269, 18.10.2018

İmanverdi Ekberli , Coşkun Gülser , Amrakh Mamedov Nutullah Özdemir

https://doi.org/10.7161/omuanajas.371463

Cited By: 5

Abstract

Phase change in soil
temperature should be taken into account in application of heat conductivity
equation to different soil layers. In this study, applicability of the solution
in daily soil temperature change was provided with consideration of phase
change in the heat conductivity equation. Root mean square error, absolute
error, maximum relative error, mean bias error, and conformity index between
measured and estimated temperature values of the solution of heat conductivity
equation, and efficiency of the model were calculated at 10, 20 and 50 cm
depths of soil. Results of statistical evaluations showed that solution of heat
conductivity equation within the given boundary condition, including phase
change, can be used for the prediction of daily temperature change along with
soil depth. Soil heat diffusivity showed declining increase with increasing in
soil moisture content, and the relationship between heat diffusivity and
moisture can be expressed by the parabolic function.

Keywords

Soil temperature, Heat conductivity, Heat diffusivity, Moisture

Faz değişimine bağlı olarak ısı iletkenliği denkleminin incelenmesi ve toprak neminin ısısal yayınıma etkisi

Abstract

Isı iletkenlik denkleminin farklı
toprak katmanlarına uygulanmasında, toprak sıcaklığındaki faz değişiminin
dikkate alınması gerekir. Bu çalışmada, farklı toprak katmanları için ısı
iletkenlik denkleminin çözümünde faz değişimi dikkate alınarak, çözümün günlük
toprak sıcaklık değişiminin tahmininde uygulanabilirliği gösterilmiştir.
Toprağın 10, 20 ve 50 cm derinliklerinde, ısı iletkenlik denkleminin çözümü ile
hesaplanan ve ölçülen sıcaklık değerleri arasındaki hata kareler ortalamasının
karekökü, mutlak hata, maksimum nispi hata, ortalama yanılgı hatası, uygunluk
indeksi ve modelin etkinliği hesaplanmıştır. İstatistiksel değerlendirmeler,
ısı iletkenlik denkleminin faz değişimini içeren sınır koşulundaki çözümünün,
toprak derinliği boyunca günlük sıcaklık değişiminin tahmininde
kullanılabilirliğini göstermektedir. Toprağın ısısal yayınım katsayısı artan
toprak nemine bağlı olarak azalan artış göstermekte, ısısal yayınım ve nem
arasındaki ilişkinin ise parabolik fonksiyonla ifadesi mümkün gözükmektedir.

Keywords

Toprak sıcaklığı, Isı iletkenlik denklemi, Isısal yayınım, Nem

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