The forms of Equations (14) and (15) bear close similarities to those of the exponential equations mentioned by Li *et al.* (2016a), except for coefficients. The coefficient values obtained from Equations (12) to (15) are presented in Table 4. The theoretical curves of Equations (14) and (15) are also illustrated in Figure 10.

Table 4

Fr . | α . | A . | B . | C . | D . | E . | R^{2}
. |
---|---|---|---|---|---|---|---|

18.879 | −0.264 | −0.280 | 0.780 | −0.031 | 0.990 | ||

152.631 | −87.87 | 12.112 | 0.0750 | 0.998 | |||

0.0745 | 0.703 | −11.808 | 15,126.758 | 0.988 | |||

17.921 | −17.26 | 300.66 | 656.25 | 0.973 |

Fr . | α . | A . | B . | C . | D . | E . | R^{2}
. |
---|---|---|---|---|---|---|---|

18.879 | −0.264 | −0.280 | 0.780 | −0.031 | 0.990 | ||

152.631 | −87.87 | 12.112 | 0.0750 | 0.998 | |||

0.0745 | 0.703 | −11.808 | 15,126.758 | 0.988 | |||

17.921 | −17.26 | 300.66 | 656.25 | 0.973 |

Figure 10

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