An investigation on the local heat transfer coefficient of a helically segmented finned tube surface in a tube bundle was conducted by experiment in cooperation with numerical calculation. In the experiment

the thermal couples were embedded only at an angle with the tube to be tested

then the temperature distribution around the tube was measured by revolving the tube under a certain experimental condition. On the basis of the experiment

the local heat transfer coefficients at different angles of the test tube surface for different experimental conditions were obtained by solving a set of two- dimensional finite difference equations. The results were fitted and the correlation equations for predicting the average and local heat transfer coefficients for helically finned tube in the tube bundle over the experimental range of Re = 20000-80000 were presented.