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Regarding sheet metal-structured packings, model development for the loading region is a difficult process because of complex vapor and liquid flow behaviors compared to the preloading and flooding regions. Therefore, only a few loading region models are available in the literature to estimate liquid holdups and load points. Also, the available models were developed with few experimental data points and with limited operating conditions. In the present study, the performances of the literature models were evaluated using 181 experimental liquid holdup and load point data points obtained from the open literature over a wide range of operating conditions. The results showed that the existing literature models are not properly accounting for the effects of different thermodynamic and geometrical properties on liquid holdups and load points. Therefore, new models were developed. The new models were verified using a wide range of experimental data gathered for different packings and different systems. The mean absolute relative error of model predictions for liquid holdups and load points are less than 10 and 20%, respectively. In addition, the new models only require readily available packing geometrical areas, void fractions, and crimp angles instead of confidential packing-specific constants or confidential packing crimp dimensions. Therefore, the new models are easy to use.

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