Thermochromic　liquid　crystal　(TLC)　was　used　in　the　transient　heat　transfer　experiments　of　rotor-stator　cavity　with　central　inlet　and　small　mass　flow　rate.　The　effects　of　mass　flow　rate　and　rotation　speed　on　rotary　disk　were　studied.　Results　showed　that,　under　the　conditions　concerned,　changes　of　mass　flow　rate　had　a　great　impact　on　heat　transfer　in　mid-radius　and　lower-radius　region,　and　had　a　less　impact　on　higher-radius　region;　increase　of　rotation　speed　intensified　the　heat　transfer　over　the　rotary　disk;　Nusselt　number　over　the　mid-radius　and　higher-radius　region　increased　with　radius　when　turbulent　flow　parameter　was　low;　the　experimental　results　were　correlated　by　turbulent　flow　parameter　and　compared　with　results　from　Reynolds　analogy,　and　the　difference　was　less　than　15%,　verifying　the　applicability　of　Reynolds　analogy　on　rotor-stator　cavity　to　a　certain　extent.　©,　2015,　BUAA　Press.　All　right　reserved.