Electronic device and heat dissipation module and centrifugal fan thereof

A centrifugal fan, comprising:

• an impeller;
• and
• a housing, comprising an upper plate, a lower plate and a side wall, wherein the upper plate axially corresponds to the lower plate, a side wall is formed between the upper plate and the lower plate, an axial inlet is formed on the upper plate, a lateral outlet is formed on the side wall, the impeller is disposed in the housing and corresponds to the axial inlet, and a flow path communicates the axial inlet to the outlet, wherein the housing further comprises a guiding groove, and at least one auxiliary inlet is formed in the guiding groove,
• wherein an included angle is formed between a plane, parallel to a rotation axis of the impeller, where the auxiliary inlet is located on and a plane, parallel to the rotation axis of the impeller, where the outlet is located on, and the included angle is between 45° and 100° , and
• wherein the flow path comprises a high pressure area and a low pressure area, the low pressure area having a pressure lower than that of the high pressure area,
• wherein the high pressure area has a path width narrower than a path width of the low pressure area and
• wherein the auxiliary inlet is located in the low pressure area at an end of the flow path closer to the lateral outlet.