| 摘要 |
A channel system is disclosed for optimizing the relation between pressure drop and heat, moisture and/or mass transfer of fluids flowing through the system. In at least one embodiment, the channel system includes at least one channel having at least one channel wall and at least one flow director having a height, the flow director extending in a fluid flow direction and transversely to the channel. It further includes an upstream portion, a downstream portion and an intermediate portion between the upstream and downstream portions, the upstream portion deviating, in the fluid flow direction, from the channel wall inwardly into the channel, and the downstream portion returning, in the fluid flow direction, towards the channel wall, wherein a transition between the intermediate portion and the downstream portion is curved with a radius. |
| 主权项 |
1. Channel system for optimising a relation between pressure drop and heat, moisture and/or mass transfer of fluids flowing through said system, said channel system comprising:
at least one channel including at least one channel wall and at least one flow director having a height, said at least one flow director extending in a fluid flow direction and transversely to said at least one channel, the at least one flow director including,
an upstream portion,a downstream portion,an intermediate portion between said upstream and downstream portions, said upstream portion deviating, in said fluid flow direction, from said at least one channel wall inwardly into said at least one channel, and said downstream portion returning, in said fluid flow direction, towards said at least one channel wall, anda transition, between said intermediate portion and said downstream portion, said transition being curved with a radius, wherein
said radius is smaller than 4.52 mm, and between 0.35*h1 and 2.1*h1, h1 being the height of the at least one flow director,a flat part of said upstream portion forms a first angle of inclination in relation to a plane of said at least one channel wall from which said upstream portion deviates,a flat part of said downstream portion forms a second angle of inclination in relation to said plane of said at least one channel wall to which said downstream portion returns, the first angle of inclination and the second angle of inclination being measured in a respective direction away from said at least one channel, the first angle of inclination being smaller than the second angle of inclination such that a rate of change in cross sectional area over the flat part of the upstream portion is smaller than a rate of change in cross sectional area over the flat part of the downstream portion,the at least one channel has a triangular cross section and a height of between 1 mm and 4 mm, to ensure a laminar flow through said channel system, andsaid at least one flow director creates an eddy that begins after the transition, between the intermediate portion and the downstream portion due to the rate of change in cross sectional area over the flat part of the downstream portion and dissipates into the laminar flow at a location beyond the at least one flow director. |
