Fluid apparatus and nozzle

A fluid device, comprising:

• an upstream path;
• and
• a downstream path, wherein
• the upstream path is connected via a connection port to the downstream path, and configured to supply fluid from the upstream path through the connection port to the downstream path,
• the connection port has a slit shape extending along a flowing direction of the fluid,
• the upstream path has a plurality of fluid paths,
• the plurality of fluid paths are connected via respective connection ports to the downstream path,
• the upstream path surrounds the downstream path,
• the plurality of fluid paths are defined by separating the upstream path with a plurality of partition walls, and
• the plurality of partition walls extend along the flowing direction of the fluid, and extend radially around the downstream path.