The logarithmic mean void fraction was introduced in literature by El Hajal et al. In the present study, approximate expressions for the logarithmic mean void fraction will be presented because the original formula for the computation of the logarithmic mean void fraction in finite precision floating-point arithmetic may suffer from serious round-off problems when both differences, e h and e ra , are very close to each other. This situation corresponds to very low values or very high values of

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... ass quality. The analogy between the logarithmic mean temperature difference in heat exchangers and the logarithmic mean void fraction in two-phase flow will be used. These approximations can be applied in the computational studies.