A slab of salmon fish which have 23C initial center temperature and 0.0735m thick are to be frozen in an air-blast freezer at 29.8C. Initial freezing temperature of fish and final center temperature of fish are 2.6C,18.7C respectively. The fish contains 80% moisture. The heat-transfer coefficient is h=17.0W/m2K. The physical properties are = 1073kg/m3 for the unfrozen salmon fish and k=1.038W/mK for the frozen salmon fish. Draw the freezing curve and calculate the freezing time of salmon fish. (12 pts) Formula: tf=(TfTa)Lx[hPa+kRa2] P=1/2 for infinite slab, 1/6 for sphere, 1/4 for infinite cylinder R=1/8 for infinite slab, 1/24 for sphere, 1/16 for infinite cylinder Latent heat of fusion of water to ice =335kj/kg