Flow-optimized line connector, and line connector assembly

A line connector assembly for fluidically connecting fluid lines, comprising a housing with a receiving space, a connection piece and a channel through which fluid can flow, wherein the channel through which fluid can flow has a first straight channel portion and a second straight channel portion, with a deflection angle α formed therebetween, and a bent channel portion, wherein a is given in radians, wherein the bent channel portion is arranged between the first and second straight channel portions and connects them to one another so that fluid can flow through them, wherein the bent channel portion has an inner channel line and an outer channel line, wherein the outer channel line is less strongly curved than the inner channel line, wherein the outer channel line of the bent channel portion has a length L over an entire extent of the bent channel portion, wherein, when the channel through which fluid can flow has a diameter d, 0.9*α*d≤L≤1.1*α*d, and when one of the first and second straight channel portions has a smaller diameter D1 and the other of the first and second straight channel portions has a larger diameter D2, 0.9*α*D1≤L≤1.1*α*D2, wherein the first straight channel portion, in a region adjacent to the inner channel line of the bent channel portion, has a cut-out, wherein two edge portions of an edge of the bent channel portion extend from the outer channel line to opposite end portions of the cut-out, wherein the line connector assembly has a line portion that is accommodated in the receiving space, wherein the cut-out is delimited by a wall of the line portion accommodated in the receiving space and by a wall of the first straight channel portion.