The　variations　of　flow　structure　and　heat　transfer　characteristics　of　impinging　air　jets　with　respect　to　mesh　solidity　are　compared　for　two　mesh　screen　locations　at　small　nozzle-to-plate　spacings.　Results　show　that　the　uniform　incoming　flow　structure　produces　higher　heat　transfer　rates　in　the　impingement　region.　The　heat　transfer　enhancement　largely　depends　on　nozzle-to-plate　spacing,　mesh　solidity,　and　jet　Reynolds　number.　The　mechanism　of　heat　transfer　enhancement　is　analyzed　in　light　of　the　field　synergy　principle.