The ornamental design for a passivecoolingelement, as shown and described.
FIG. 1 is a top perspective of a first embodiment for a passive cooling element in accord with the present disclosure; in FIG. 1 phantom lines indicating portions not specifically forming part of the claimed embodiment and solid lines indicating surfaces of a heat dissipating member;
FIG. 2 is a front elevational view of the passive cooling element of FIG. 1, an opposite bottom view being devoid of ornamentation;
FIG. 3 is a first side perspective view of the passive cooling element of FIG. 1; a second, opposite, view being substantially a mirror image;
FIG. 4 is a top elevational view of the passive cooling element of FIG. 1; and
FIG. 5 is a bottom elevational view of the passive cooling element of FIG. 1;
FIG. 6 is a bottom elevational view of a second embodiment of the passive cooling element of FIG. 1 illustrating a straight outward-edged fin;
FIG. 7 is a bottom elevational view of a third embodiment of the passive cooling element of FIG. 1 illustrating a rectangular fin interruption;.
FIG. 8 is a bottom elevational view of a fourth embodiment of the passive cooling element of FIG. 1 illustrating a straight side-edged fin; and,
FIG. 9 is a bottom elevational view of a fifth embodiment of the passive cooling element of FIG. 1 illustrating additional fin interruptions.
The broken lines defining portions of the passive cooling element are for illustrative purposes only and form no part of the claimed design.