The heat transfer characteristics and pressure drop in the channel with V corrugated upper and lower plates under constant heat flux are presented. The test section is the channel with two opposite corrugated plates on which all configuration peaks lie in a staggered arrangement. Corrugated plates with three different corrugated tile angles of 20, 40 and 60 are tested. The experiments are performed for Reynolds number and heat flux in the ranges of 2000-9000 and 0.5-1.2 kW/m(2), respectively. The effects of the different geometrical parameters of the corrugated structure and heat flux on the heat transfer characteristics and pressure drop are discussed. A turbulent mathematical model is employed to determine the temperature and velocity distributions. The corrugated surface has a significant effect on the enhancement of heat transfer and pressure drop. Because of the presence of recirculation zones, the heat transfer coefficients obtained from the channel with the corrugated surface are higher than those with the plain surface. However, the pressure drop also increases. (C) 2006 Elsevier Ltd. All rights reserved.