Two-phase split of refrigerants at a T-junction

Numerical model of two-phase refrigerant flow distribution in a plate evaporator with distributors

“…; m i,in,dist and m i,br,dist are the mass flow rates of two-phase refrigerant in the inlet of manifold and the branch of the flow domain in the distributor; x i,in,dist and x i,br,dist are the vapor qualities in the inlet of the manifold and the branch of the flow domain in the distributor; F i,g and F i,l are phase split coefficients of vapor refrigerant and liquid refrigerant in the distributor for i th branch, and are defined as the mass flow rate ratios of vapor refrigerant and liquid refrigerant in the i th branch to that of the i th distributor inlet [34], respectively, as shown in Eqs. (4) and (5).…”

“…(16), the static pressure loss (DP in-br,dist ) juc is composed of reversible pressure drop (DP in-br,dist ) rev and irreversible pressure drop (DP in-br,dist ) irr [34]:…”

Two-phase flow distribution in multiple parallel tubes

“…For predicting the pressure change in two-phase flow dividing T-junctions several models have been presented in the literature and a summary is given by Buell et al [15]. The model implemented in this work is reported in Tae and Cho (12) and considers both the reversible pressure variation (due to the flow rate decrease) and the irreversible pressure variation (due to the change of the flow direction and the orifice losses). The irreversible term is only considered for predicting the pressure variation between the inlet and branch positions:…”

“…2 where the dividing T-junction model of Hwang et al [10] is compared against both annular and stratified flow experimental data. The annular flow regime experimental data were taken from Tae and Cho [12] (where specific geometric equations to represent the annular flow regime in the Hwang et al model were reported) while the stratified flow regime experimental data were obtained from Marti and Shoham [11] (in this case, the corresponding geometric equations have been deduced).…”

Performance comparison of microchannel evaporators with refrigerant R-22

“…Many studies on the flow maldistribution in the area of heat exchangers were conducted under the simple geometry like Tjunction [1][2][3][4][5][6] or multi-branch [7][8] with round tubes. For adiabatic conditions with microchannel tubes, Tompkins et al [9] studied flow distribution and pressure drop in microchannel manifolds.…”