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A large-scale closed magnetic field can transfer angular momentum and energybetween a black hole (BH) and its surrounding accretion flow. We investigatethe effects of this magnetic coupling (MC) process on the dynamics of a hotaccretion flow (e.g., an advection dominated accretion flow, hereafter ADAF).The energy and angular momentum fluxes transported by the magnetic field arederived by an equivalent circuit approach. For a rapidly rotating BH, it isfound that the radial velocity and the electron temperature of the accretionflow decrease, whereas the ion temperature and the surface density increase.The significance of the MC effects depends on the value of the viscousparameter \alpha. The effects are obvious for \alpha=0.3 but nearly ignorablefor \alpha=0.1. For a BH with specific angular momentum, a_*=0.9, and\alpha=0.3, we find that for reasonable parameters the radiative efficiency ofa hot accretion flow can be increased by about 30%.

Influence of the Magnetic Coupling Process on the Advection Dominated Accretion Flows around Black Holes