“…Mass transfer rate (e.g., oxygen transfer rate, CO 2 transfer rate (CTR), and ion transfer rate) is one of major performance characteristic of such contactors . CTR is considered as an important parameter of HFMCs in processes such as degassing, acid‐gas capture, CO 2 removal from flue gases, etc . In literature, several approaches have been already proposed to determine CTR through HFMCs; however, such methods are rather complicated, time consuming, or less adequate …”