Experimental study on the heat transfer of gas with coagulative particles flowing through a packed granular bed filter

An experimental study was carried out on heat transfer of gas with coagulative particles flowing through a packed granular bed. A logarithmic mean temperature difference (LMTD) method was used to obtain the overall heat transfer coefficient. An empirical formula was used to compare with the experimental results. The results show that the heat quantity released by the concretion of coagulative particles has an improved influence on the heat transfer when the inlet gas temperature of packed bed is above the melting point of the coagulative particles and outlet gas temperature is below the melting point. However, the heat quantity absorbed by the melting of coagulative particles can weaken the heat transfer when both the inlet and outlet gas temperature of the packed bed are above the melting point of coagulative particles. Two modified correlations are proposed to give the Nusselt number.