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Table 3 Key drift–flux parameters in Eq. (13)

From: Modelling an unconventional closed-loop deep borehole heat exchanger (DBHE): sensitivity analysis on the Newberry volcanic setting

Description Equation
Slip between two phases \(\gamma = S_{\text{G}}(\rho_{\text{G}}\rho_{\text{L}}\rho_{\text{m}}/\rho ^{*2}_{\text{m}})[(C_{0}-1)u_{\text{m}}+u_{\text{d}}]^{2}/(1-S_{\text{G}})\)
Mixture density \(\rho_{\text{m}} = S_{\text{G}}\rho_{\text{G}}+(1-S_{\text{G}})\rho _{\text{L}}\)
Mixture velocity \(u_{\text{m}} = [S_{\text{G}}\rho_{\text{G}}u_{\text{G}} + (1-S_{\text{G}})\rho_{\text{L}}u_{\text{L}}]/\rho_{\text{m}}\)
Adjusted average density of mixture \(\rho ^{*}_{\text{m}} = S_{\text{G}}C_{0}\rho_{\text{G}}+(1-S_{\text{G}}C_{0})\rho_{\text{L}}\)