The calculation of frictional pressure drop for two-phase flow in pipes is required by a variety
of design practices. In the past six decades, many correlations for two-phase frictional …

The present paper reports condensing two-phase flow pressure drop gradient and heat
transfer coefficient (HTC) inside a mini-channel multiport tube with R1234yf and R134a …

Using only a limited number of computationally expensive functions, we show a way how to
construct accurate and computationally efficient approximations of the Colebrook equation …

One of the parameters involved in the design of pressurized hydraulic systems is the
pressure drop in the pipes. The verification of the pressure drop can be performed through …

The Colebrook equation is a popular model for estimating friction loss coefficients in water
and gas pipes. The model is implicit in the unknown flow friction factor, f. To date, the …

This paper presents evolutionary optimization of explicit approximations of the empirical
Colebrook's equation that is used for the calculation of the turbulent friction factor (λ), ie, for …

The empirical Colebrook equation from 1939 is still accepted as an informal standard way to
calculate the friction factor of turbulent flows (4000< Re< 108) through pipes with roughness …

The calculation of two-phase frictional pressure drop for condensing flow in pipes is
essential in many areas. Although numerous studies concerning this issue have been …

The implicit Colebrook equation has been the standard for estimating pipe friction factor in a
fully developed turbulent regime. Several alternative explicit models to the Colebrook …

The present paper reports condensing two-phase flow pressure drop inside a mini-channel
tube with 1.16 mm inner hydraulic diameter with R1234yf, R134a and R32. According to the …