The present invention relates to a double pipe and, more specifically, to a double pipe for uniformly distributing a flow, which can distribute as uniformly as possible a flow which should be distributed toward branch pipes thereof. The present invention relates to a double pipe for uniformly distributing a flow, and can be applied to a seawater desalination device or a water purification device using a membrane and can be thus employed in the water treatment plant industry.

A method of forming three-dimensional shaped microparticles in a microfluidic device includes flowing a mixture of a monomer and photoinitiator in a microfluidic channel having a plurality of pillars disposed therein to define a flow stream having a pre-defined shape and temporarily stopping the same. One or more portions of the flow stream are polymerized by passing polymerizing light through one or more masks and onto the flow stream, the polymerization process forming a plurality of three-dimensional shaped microparticles. The three-dimensional shape of the microparticle may be geometrically complex by using non-rectangular 2D orthogonal shapes for the flow and/or masked light source. The microparticles may include protected regions on which cells can be adhered to and protected from shear forces. The flow stream is restarted to flush out the newly formed microparticles and prepare the device for the next cycle of particle formation.

An enclosure having an outer surface with a vortex-induced vibration suppression function is provided. The outer surface of the enclosure is provided with a plurality of annular recesses surrounding the enclosure, such that alternately concave and convex annular recesses and annular bosses configured for disrupting a boundary layer of a laminar flow are formed on the outer surface of the enclosure. An outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed in a circumferential direction of the annular boss. The air guiding grooves are inclined upward or downward, such that part of an upwind incoming flow flowing to the annular boss can be guided into the annular recesses adjacent to the annular boss via the air guiding grooves. With the convex-concave outer surface, the cause of formation of the vortex-induced vibration can be prevented.

An enclosure having an outer surface with a vortex-induced vibration suppression function is provided. The outer surface of the enclosure is provided with a plurality of annular recesses surrounding the enclosure, such that alternately concave and convex annular recesses and annular bosses configured for disrupting a boundary layer of a laminar flow are formed on the outer surface of the enclosure. An outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed in a circumferential direction of the annular boss. The air guiding grooves are inclined upward or downward, such that part of an upwind incoming flow flowing to the annular boss can be guided into the annular recesses adjacent to the annular boss via the air guiding grooves. With the convex-concave outer surface, the cause of formation of the vortex-induced vibration can be prevented.

An enclosure having an outer surface with a vortex-induced vibration suppression function is provided. The outer surface of the enclosure is provided with a plurality of annular recesses surrounding the enclosure, such that alternately concave and convex annular recesses and annular bosses configured for disrupting a boundary layer of a laminar flow are formed on the outer surface of the enclosure. An outer surface of the annular boss is provided with a plurality of air guiding grooves, and the plurality of air guiding grooves are distributed in a circumferential direction of the annular boss. The air guiding grooves are inclined upward or downward, such that part of an upwind incoming flow flowing to the annular boss can be guided into the annular recesses adjacent to the annular boss via the air guiding grooves. With the convex-concave outer surface, the cause of formation of the vortex-induced vibration can be prevented.

A passive flow divider for providing outflows is described. The passive flow divider includes at least one inlet for an inflow and a plurality of outlets for said outflows, a housing enclosing a main partition that separates an intake space and a discharge space, a common end located at an interface between the intake space and the discharge space, and a baffle arranged in the intake space between said inlet and the common end. The passive flow divider further includes a plurality of distribution chambers arranged in the discharge space and adjacent to each other, each distribution chamber being arranged to lead an outflow from the common end to one of the outlets.

Apparatus and method disclosed herein related to first stage gravity separation of liquid and sand from a gaseous fluid stream in an upper portion of a desanding vessel, sand separating from gas along an annular path about a shell, the sand-free gas directed back down into the shell to a fluid outlet for removal as a product stream. A second stage gravity separation of sand from accumulated liquid occurs in a lower section of the vessel. An optional final or polishing stage of the liquid is conduct using a filter. A stacked-plate filter can extend an intake opening of the fluid outlet into the accumulated liquid. Further, the filter plates can be configured with parallel filtering of gas/liquid separation for gas intake above, and with liquid/sand separation below including pressure management of the filter operation.

A method of forming three-dimensional shaped microparticles in a microfluidic device includes flowing a mixture of a monomer and photoinitiator in a microfluidic channel having a plurality of pillars disposed therein to define a flow stream having a pre-defined shape and temporarily stopping the same. One or more portions of the flow stream are polymerized by passing polymerizing light through one or more masks and onto the flow stream, the polymerization process forming a plurality of three-dimensional shaped microparticles. The three-dimensional shape of the microparticle may be geometrically complex by using non-rectangular 2D orthogonal shapes for the flow and/or masked light source. The microparticles may include protected regions on which cells can be adhered to and protected from shear forces. The flow stream is restarted to flush out the newly formed microparticles and prepare the device for the next cycle of particle formation.

A method of forming three-dimensional shaped microparticles in a microfluidic device includes flowing a mixture of a monomer and photoinitiator in a microfluidic channel having a plurality of pillars disposed therein to define a flow stream having a pre-defined shape and temporarily stopping the same. One or more portions of the flow stream are polymerized by passing polymerizing light through one or more masks and onto the flow stream, the polymerization process forming a plurality of three-dimensional shaped microparticles. The three-dimensional shape of the microparticle may be geometrically complex by using non-rectangular 2D orthogonal shapes for the flow and/or masked light source. The microparticles may include protected regions on which cells can be adhered to and protected from shear forces. The flow stream is restarted to flush out the newly formed microparticles and prepare the device for the next cycle of particle formation.

A fluid component includes a cross-shaped body having laterally extending first and second flow ports and axially extending first and second access ports. The first flow port connected in fluid communication with the first access port by a first branch port. The second flow port connected in fluid communication with the second access port by a second branch port. The first and second access ports are connected in fluid communication by a convoluted flow restricting passage extending generally axially from the first access port to the second access port.