Effects of wall temperature and temperature-dependent viscosity on maximum spreading of water-in-oil emulsion droplet

•Droplet impact of n-decane and water-in-oil emulsions onto a heated solid surface is studied.•Outcomes of the droplet impact onto a heated surface are identified, given heat transfer.•Maximum spreading diameter of an emulsion droplet is measured in a range of We=100–500.•Empirical model of maximum spreading is proposed and tested at We=60–900, Oh=0.001–0.015.•Model involves temperature-dependent viscosity and explicit impact surface temperature.