What kind of unit is w/mk? Is that supposed to be W/mK? Kind of worrying if a heat sink manufacturer / distributor can not even get the figure of merit right.
My guess is that the air flow impedance is so high barely any air will flow through the heat sink unless you have a fan designed for a very high static pressure with a sealed tunnel between fan and heat sink. If anything, it might perform superior to traditional finned heat sinks in very low airflow passive setups where convection is the main source of cooling. But obviously only a well designed tests can determine this, since apparently the manufacturer is unable to provide any technical details.
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