без необходимости

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This needlessly restricts the maximum allowable sample-cell length.

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Без необходимости (разматывать)-- Hose reels will operate without having to roll out the entire hose length. Без необходимости (отсоединения)-- It must be possible to take off the insulating jacket without having necessarily to remove the connecting pipes. Без необходимости -- without the need, without the necessity, without having + inf.; unnecessarily (before adj.)

 This allows comparison of observed drop-size distributions without having to make comparison of the overall performance of the fuel nozzles.

 In addition, the melting of this loose solid bed would seem to be such that local, unnecessarily high temperatures, are more or less avoided.