Cooling apparatus

Abstract

Fins are each formed with a flat shape in a height direction, which is orthogonal to a flow direction of coolant in a coolant passage, and a plurality of the fins are provided intermittently along virtual waveforms extending in the flow direction and making a plurality of rows in a width direction that is orthogonal to the height direction and to the flow direction. An upstream portion of a first fin provided in a first row overlaps with the position in the flow direction f of a downstream portion of a second fin provided in a second row adjacent to the first row. Furthermore, the downstream portion of the first fin overlaps with a position in the flow direction of an upstream portion of a third fin provided in the second row.

What is claimed is: 
     
         1 . A cooling apparatus comprising a plurality of fins within a coolant passage near a heat source body,
 wherein the plurality of fins each have a flat shape in a height direction orthogonal to a flow direction of coolant in the coolant passage, and are provided intermittently along virtual waveforms that extend in the flow direction and that make a plurality of rows in a width direction orthogonal to the flow direction and to the height direction, and   with a fin provided in a first row being a first fin and two fins lined up in the flow direction and provided in a second row adjacent to the first row being a second fin and a third fin, an upstream portion including an upstream end of the first fin overlaps with a position in the flow direction of a downstream portion including a downstream end of the second fin, and a downstream portion including a downstream end of the first fin overlaps with a position in the flow direction of an upstream portion including an upstream end of the third fin.   
     
     
         2 . The cooling apparatus according to  claim 1 , wherein the fins are provided along portions of the waveforms including two peaks. 
     
     
         3 . The cooling apparatus according to  claim 2 , wherein the waveforms have shapes symmetrical on an axis that is a virtual line that passes through the peaks, is orthogonal to the flow direction, and is parallel to the width direction. 
     
     
         4 . The cooling apparatus according to  claim 1 , wherein the fins each have the same shape in cross-sectional planes parallel to the flow direction and to the width direction. 
     
     
         5 . The cooling apparatus according to  claim 1 , wherein in a case where a length of a half wavelength of the waveform in the flow direction is λ/2 and a length of the fin in the flow direction is L, [{L−(λ/2)}/λ/2]×100 is greater than or equal to 30% and less than 50%.