Flow channel structure

A flow channel structure comprising a member that comprises a flow channel, the flow channel comprising:

• a first bifurcation;
• and
• a plurality of second bifurcations, wherein
• the first bifurcation and the second bifurcations each comprise:
• a first part that extends in a first direction;
• a plurality of second parts having a same channel length and each extending in the first direction;
• and
• a plurality of connections, each of which connects the first part and a corresponding one of the second parts, and includes a first bend and a second bend,
• the first bend arcuately extends with a first curvature and a central angle of greater than 90 degrees, and has a first end connected to the corresponding one of the second parts and a second end opposite to the first end,
• the second bend arcuately extends with a second curvature, and has a third end and a fourth end, the third end connected to the second end of the first bend, the fourth end opposite to the third end and connected to the first part,
• a tangent to the first end of the first bend extends in a same direction as the corresponding one of the second parts extends,
• a tangent to the second end of the first bend is the same as a tangent to the third end of the second bend,
• a tangent to the fourth end of the second bend extends in the first direction,
• the connections have a same channel length,
• the second parts of the first bifurcation are connected with the first parts of the different second bifurcations, respectively, and
• the tangent to the first end of the first bend of the first bifurcation is the same as the tangent to the fourth end of the second bend of the second bifurcations, the first end connected with the fourth end through the first part and the corresponding one of the second parts.