Design of an ohmic reactor to study the kinetics of thermal reactions in liquid products

Pasteurization of citrus juices with ohmic heating to preserve the carotenoid profile

“…Ohmic treatments were performed in a 100 mL capacity laboratory-scale static reactor, as described in (Roux, Courel, Picart-Palmade, & Pain, 2010). Electrodes were made of titanium covered with a specific alloy to avoid electrolysis.…”

Beyond electrolysis: old challenges and new concepts of electricity-driven chemical reactors

“…In the area of reaction engineering, however, the literature on this type of energy transfer mechanism is scarce, with only a few papers published in the recent years. [108][109][110][111] Among other things, Pinto et al 109 have shown that Ohmic heating not only could shorten the reaction time with respect to the traditional oil bath but was also able to deliver significantly higher yields than the microwave heating for various organic synthesis reactions in water. Another interesting concept has been presented is the recent Science paper by Wismann and co-authors, 111 who proposed a new, electric resistance-heated reactor for the steam reforming of (Fig.…”

Comparative thermal impact of two UHT technologies, continuous ohmic heating and direct steam injection, on the nutritional properties of liquid infant formula

“…The liquid product was packed into vacuum bags of 1 ton (2 units, one for each trial), transported and stored at 4 °C for 4 days. (g/L) 1026 ± 4 Viscosity (b) (mPa.s) exp(0.633 -0.016×T + 1.78E-5×T 2 ) Specific heat capacity (c) (J/kg/K) 3939 + 0.16×T + 0.0041×T 2 Thermal conductivity (c) (W/m/K) 0.534 + 0.0016×T -6.37E-6×T 2 Electrical conductivity (d) (S/m) 0.1082 + 0.008142×T (a) Measured (n = 192), decrease of about 6% between 20 and 140 °C (second order equation) c (b) According to McCarthy (2011), considered equivalent to milk (0.03-15% fat, 70-135 °C), T in °C (c) According to Singh and Heldman (2001), temperature range of 0-150 °C, T in °C (d) According to Roux et al (2010), temperature range of 20-140 °C, T in °C 2.2. Analytical methods…”

“…Even though it is based on the 3/16 use of electricity which is less and less appreciated today, the electrical conversion into heat energy is close to 100% (Ghnimi et al, 2007) and the very low thermal inertia makes possible fast and precise regulation. Heat transfer is a function of the electrical and thermal parameters of the product and equipment which makes the process easy-to-drive (Goullieux and Pain, 2014;Roux et al, 2010). However, fouling on electrode surfaces constitutes one of the main problems of OH (Ayadi et al, 2004(Ayadi et al, , 2005Fillaudeau et al, 2007;Stancl and Zitny, 2010).…”